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qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

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  • JonBJ JonB

    @actionmystique
    If you are running as root but not logged on as root I still wonder if that is the issue.

    Xorg

    By default, and for security reasons, root will be unable to connect to a non-root user's X server. There are multiple ways of allowing root to do so however, if necessary.

    https://wiki.archlinux.org/title/Running_GUI_applications_as_root

    Maybe this is an issue, maybe it is not.

    A Offline
    A Offline
    actionmystique
    wrote on last edited by
    #130

    @JonB
    I tried:

    1. login as root: same result
    2. add one policy kit file for env and for SeaTools: same result
      org.freedesktop.policykit.pkexec.policy
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE policyconfig PUBLIC
     "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
     "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
    <policyconfig>
      <action id="org.freedesktop.policykit.pkexec.run-env">
        <description>Run env</description>
        <message>Authentication is required to run env</message>
        <defaults>
          <allow_any>no</allow_any>
          <allow_inactive>no</allow_inactive>
          <allow_active>auth_admin_keep</allow_active>
        </defaults>
        <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/env</annotate>
        <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
      </action>
      <action id="org.freedesktop.policykit.pkexec.run-SeaTools">
        <description>Run SeaTools</description>
        <message>Authentication is required to run SeaTools</message>
        <defaults>
          <allow_any>no</allow_any>
          <allow_inactive>no</allow_inactive>
          <allow_active>auth_admin_keep</allow_active>
        </defaults>
        <annotate key="org.freedesktop.policykit.exec.path">/opt/SeaTools5/SeaTools</annotate>
        <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
      </action>
    </policyconfig>
    

    However, I did notice one file which may or may not be adequate: qt.conf

    # Generated by linuxdeployqt
    # https://github.com/probonopd/linuxdeployqt/
    [Paths]
    Prefix = ./
    Plugins = plugins
    Imports = qml
    Qml2Imports = qml
    
    A 1 Reply Last reply
    0
    • A actionmystique

      @JonB
      I tried:

      1. login as root: same result
      2. add one policy kit file for env and for SeaTools: same result
        org.freedesktop.policykit.pkexec.policy
      <?xml version="1.0" encoding="UTF-8"?>
      <!DOCTYPE policyconfig PUBLIC
       "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
       "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
      <policyconfig>
        <action id="org.freedesktop.policykit.pkexec.run-env">
          <description>Run env</description>
          <message>Authentication is required to run env</message>
          <defaults>
            <allow_any>no</allow_any>
            <allow_inactive>no</allow_inactive>
            <allow_active>auth_admin_keep</allow_active>
          </defaults>
          <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/env</annotate>
          <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
        </action>
        <action id="org.freedesktop.policykit.pkexec.run-SeaTools">
          <description>Run SeaTools</description>
          <message>Authentication is required to run SeaTools</message>
          <defaults>
            <allow_any>no</allow_any>
            <allow_inactive>no</allow_inactive>
            <allow_active>auth_admin_keep</allow_active>
          </defaults>
          <annotate key="org.freedesktop.policykit.exec.path">/opt/SeaTools5/SeaTools</annotate>
          <annotate key="org.freedesktop.policykit.exec.allow_gui">TRUE</annotate>
        </action>
      </policyconfig>
      

      However, I did notice one file which may or may not be adequate: qt.conf

      # Generated by linuxdeployqt
      # https://github.com/probonopd/linuxdeployqt/
      [Paths]
      Prefix = ./
      Plugins = plugins
      Imports = qml
      Qml2Imports = qml
      
      A Offline
      A Offline
      actionmystique
      wrote on last edited by
      #131

      Has anyone tried to run SeaTools from seagate on Ubuntu?

      1 Reply Last reply
      0
      • M Offline
        M Offline
        mywings19
        wrote on last edited by
        #132

        hi,
        I'm facing similar issue.could you give me some suggestion?
        my QT version is:Qt Creator 8.0.1 based on Qt 6.3.1

        the error message:
        qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" even though it was found.
        This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
        Available platform plugins are: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.

        Then I've set 'export QT_DEBUG_PLUGINS=1'
        but there's no extra error message,qtcreator is running normally

        And I've run 'ldd libqxcb.so',result is

                linux-vdso.so.1 (0x00007ffcdb970000)
                libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6XcbQpa.so.6 (0x00007f02bc4a5000)
                libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f02bc476000)
                libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f02bc434000)
                libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f02bc42d000)
                libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f02bc427000)
                libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f02bc422000)
                libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f02bc40e000)
                libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f02bc407000)
                libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f02bc402000)
                libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f02bc3f8000)
                libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f02bc3ee000)
                libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f02bc3df000)
                libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f02bc3d8000)
                libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f02bc3ba000)
                libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f02bc390000)
                libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6OpenGL.so.6 (0x00007f02bc2ee000)
                libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Gui.so.6 (0x00007f02bb96b000)
                libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f02bb8d7000)
                libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Core.so.6 (0x00007f02bb272000)
                libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f02bb26d000)
                libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f02bb12c000)
                libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f02bb127000)
                libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f02bb106000)
                libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f02baf82000)
                libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f02badfd000)
                libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f02bade3000)
                libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f02bac22000)
                libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f02bab03000)
                libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f02baafe000)
                libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007f02baaf2000)
                libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f02baaed000)
                libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f02baae5000)
                libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f02baad0000)
                libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f02baa8a000)
                libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6DBus.so.6 (0x00007f02ba9b8000)
                libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f02ba99b000)
                libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f02ba8df000)
                libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f02ba8ab000)
                libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f02ba7ee000)
                libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicui18n.so.56 (0x00007f02ba353000)
                libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicuuc.so.56 (0x00007f02b9f9b000)
                libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicudata.so.56 (0x00007f02b85b8000)
                librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f02b85ae000)
                /lib64/ld-linux-x86-64.so.2 (0x00007f02bc55d000)
                libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f02b853a000)
                libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f02b8520000)
                libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f02b84e1000)
                libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f02b84d8000)
                libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f02b8485000)
                libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f02b844c000)
                libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f02b8437000)
                libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f02b8394000)
                liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f02b836c000)
                liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f02b834d000)
                libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f02b8228000)
                libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f02b8205000)
        

        what to do next?thank you!

        JonBJ 1 Reply Last reply
        0
        • M mywings19

          hi,
          I'm facing similar issue.could you give me some suggestion?
          my QT version is:Qt Creator 8.0.1 based on Qt 6.3.1

          the error message:
          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" even though it was found.
          This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
          Available platform plugins are: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.

          Then I've set 'export QT_DEBUG_PLUGINS=1'
          but there's no extra error message,qtcreator is running normally

          And I've run 'ldd libqxcb.so',result is

                  linux-vdso.so.1 (0x00007ffcdb970000)
                  libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6XcbQpa.so.6 (0x00007f02bc4a5000)
                  libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007f02bc476000)
                  libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f02bc434000)
                  libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f02bc42d000)
                  libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f02bc427000)
                  libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f02bc422000)
                  libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f02bc40e000)
                  libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f02bc407000)
                  libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f02bc402000)
                  libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f02bc3f8000)
                  libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f02bc3ee000)
                  libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f02bc3df000)
                  libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f02bc3d8000)
                  libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f02bc3ba000)
                  libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f02bc390000)
                  libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6OpenGL.so.6 (0x00007f02bc2ee000)
                  libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Gui.so.6 (0x00007f02bb96b000)
                  libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f02bb8d7000)
                  libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6Core.so.6 (0x00007f02bb272000)
                  libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f02bb26d000)
                  libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f02bb12c000)
                  libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f02bb127000)
                  libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f02bb106000)
                  libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f02baf82000)
                  libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f02badfd000)
                  libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f02bade3000)
                  libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f02bac22000)
                  libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f02bab03000)
                  libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f02baafe000)
                  libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007f02baaf2000)
                  libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f02baaed000)
                  libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f02baae5000)
                  libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f02baad0000)
                  libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f02baa8a000)
                  libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libQt6DBus.so.6 (0x00007f02ba9b8000)
                  libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f02ba99b000)
                  libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f02ba8df000)
                  libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f02ba8ab000)
                  libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f02ba7ee000)
                  libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicui18n.so.56 (0x00007f02ba353000)
                  libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicuuc.so.56 (0x00007f02b9f9b000)
                  libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/./../../lib/libicudata.so.56 (0x00007f02b85b8000)
                  librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f02b85ae000)
                  /lib64/ld-linux-x86-64.so.2 (0x00007f02bc55d000)
                  libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f02b853a000)
                  libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f02b8520000)
                  libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f02b84e1000)
                  libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f02b84d8000)
                  libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f02b8485000)
                  libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f02b844c000)
                  libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f02b8437000)
                  libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f02b8394000)
                  liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f02b836c000)
                  liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f02b834d000)
                  libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f02b8228000)
                  libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f02b8205000)
          

          what to do next?thank you!

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #133

          @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

          Then I've set 'export QT_DEBUG_PLUGINS=1'
          but there's no extra error message,qtcreator is running normally

          Have you actually run whatever executable raises the error (Qt Creator itself?? Your application?) from the shell where you set this environment variable, like all the posts tell you to? Because if so you should get a whole bunch of diagnostic output lines....

          M 1 Reply Last reply
          0
          • JonBJ JonB

            @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

            Then I've set 'export QT_DEBUG_PLUGINS=1'
            but there's no extra error message,qtcreator is running normally

            Have you actually run whatever executable raises the error (Qt Creator itself?? Your application?) from the shell where you set this environment variable, like all the posts tell you to? Because if so you should get a whole bunch of diagnostic output lines....

            M Offline
            M Offline
            mywings19
            wrote on last edited by
            #134

            @JonB

            sugon@EC:~$ cat ~/.bashrc
            # ~/.bashrc: executed by bash(1) for non-login shells.
            # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
            # for examples
            
            # If not running interactively, don't do anything
            case $- in
                *i*) ;;
                  *) return;;
            esac
            
            # don't put duplicate lines or lines starting with space in the history.
            # See bash(1) for more options
            HISTCONTROL=ignoreboth
            
            # append to the history file, don't overwrite it
            shopt -s histappend
            
            # for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
            HISTSIZE=1000
            HISTFILESIZE=2000
            
            # check the window size after each command and, if necessary,
            # update the values of LINES and COLUMNS.
            shopt -s checkwinsize
            
            # If set, the pattern "**" used in a pathname expansion context will
            # match all files and zero or more directories and subdirectories.
            #shopt -s globstar
            
            # make less more friendly for non-text input files, see lesspipe(1)
            #[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"
            
            # set variable identifying the chroot you work in (used in the prompt below)
            if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
                debian_chroot=$(cat /etc/debian_chroot)
            fi
            
            # set a fancy prompt (non-color, unless we know we "want" color)
            case "$TERM" in
                xterm-color|*-256color) color_prompt=yes;;
            esac
            
            # uncomment for a colored prompt, if the terminal has the capability; turned
            # off by default to not distract the user: the focus in a terminal window
            # should be on the output of commands, not on the prompt
            #force_color_prompt=yes
            
            if [ -n "$force_color_prompt" ]; then
                if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
                    # We have color support; assume it's compliant with Ecma-48
                    # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
                    # a case would tend to support setf rather than setaf.)
                    color_prompt=yes
                else
                    color_prompt=
                fi
            fi
            
            if [ "$color_prompt" = yes ]; then
                PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
            else
                PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
            fi
            unset color_prompt force_color_prompt
            
            # If this is an xterm set the title to user@host:dir
            case "$TERM" in
            xterm*|rxvt*)
                PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
                ;;
            *)
                ;;
            esac
            
            # enable color support of ls and also add handy aliases
            if [ -x /usr/bin/dircolors ]; then
                test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
                alias ls='ls --color=auto'
                #alias dir='dir --color=auto'
                #alias vdir='vdir --color=auto'
            
                #alias grep='grep --color=auto'
                #alias fgrep='fgrep --color=auto'
                #alias egrep='egrep --color=auto'
            fi
            
            # colored GCC warnings and errors
            #export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'
            
            # some more ls aliases
            #alias ll='ls -l'
            #alias la='ls -A'
            #alias l='ls -CF'
            
            # Alias definitions.
            # You may want to put all your additions into a separate file like
            # ~/.bash_aliases, instead of adding them here directly.
            # See /usr/share/doc/bash-doc/examples in the bash-doc package.
            
            if [ -f ~/.bash_aliases ]; then
                . ~/.bash_aliases
            fi
            
            # enable programmable completion features (you don't need to enable
            # this, if it's already enabled in /etc/bash.bashrc and /etc/profile
            # sources /etc/bash.bashrc).
            if ! shopt -oq posix; then
              if [ -f /usr/share/bash-completion/bash_completion ]; then
                . /usr/share/bash-completion/bash_completion
              elif [ -f /etc/bash_completion ]; then
                . /etc/bash_completion
              fi
            fi
            # Set LS_COLORS environment by Deepin
            if [[ ("$TERM" = *256color || "$TERM" = screen* || "$TERM" = xterm* ) && -f /etc/lscolor-256color ]]; then
                eval $(dircolors -b /etc/lscolor-256color)
            else
                eval $(dircolors)
            fi
            
            export QT_DEBUG_PLUGINS=1
            export QT_QPA_PLATFORM_PLUGIN_PATH=/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms
            sugon@EC:~$ source ~/.bashrc
            sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
            sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test
            qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms" even though it was found.
            This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
            
            Available platform plugins are: linuxfb, minimal, offscreen, vnc, eglfs, minimalegl, vkkhrdisplay, wayland-egl, wayland, xcb.
            
            Aborded
            sugon@EC:~$ ldd ~/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/libqxcb.so 
                    linux-vdso.so.1 (0x00007ffeb7df5000)
                    libQt6XcbQpa.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6XcbQpa.so.6 (0x00007fd7162df000)
                    libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x00007fd7162b0000)
                    libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007fd71626e000)
                    libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007fd716267000)
                    libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007fd716261000)
                    libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007fd71625c000)
                    libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007fd716248000)
                    libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007fd716241000)
                    libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fd71623c000)
                    libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007fd716232000)
                    libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007fd716228000)
                    libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007fd716219000)
                    libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007fd716212000)
                    libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007fd7161f4000)
                    libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fd7161ca000)
                    libQt6OpenGL.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6OpenGL.so.6 (0x00007fd716128000)
                    libQt6Gui.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6Gui.so.6 (0x00007fd7157a5000)
                    libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007fd715711000)
                    libQt6Core.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6Core.so.6 (0x00007fd7150ac000)
                    libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fd7150a7000)
                    libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007fd714f66000)
                    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd714f61000)
                    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd714f40000)
                    libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fd714dbc000)
                    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd714c37000)
                    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd714c1d000)
                    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd714a5c000)
                    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007fd71493d000)
                    libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007fd714938000)
                    libxcb-util.so.0 => /lib/x86_64-linux-gnu/libxcb-util.so.0 (0x00007fd71492c000)
                    libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007fd714927000)
                    libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fd71491f000)
                    libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x00007fd71490a000)
                    libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007fd7148c4000)
                    libQt6DBus.so.6 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libQt6DBus.so.6 (0x00007fd7147f2000)
                    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd7147d5000)
                    libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fd714719000)
                    libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fd7146e5000)
                    libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fd714628000)
                    libicui18n.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicui18n.so.56 (0x00007fd71418d000)
                    libicuuc.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicuuc.so.56 (0x00007fd713dd5000)
                    libicudata.so.56 => /home/sugon/Software/qtcreator8.0.1/lib/Qt/plugins/platforms/../../lib/libicudata.so.56 (0x00007fd7123f2000)
                    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fd7123e8000)
                    /lib64/ld-linux-x86-64.so.2 (0x00007fd716397000)
                    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007fd712374000)
                    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fd71235a000)
                    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fd71231b000)
                    libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fd712312000)
                    libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007fd7122bf000)
                    libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fd712286000)
                    libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007fd712271000)
                    libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007fd7121ce000)
                    liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fd7121a6000)
                    liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007fd712187000)
                    libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007fd712062000)
                    libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007fd71203f000)
            sugon@EC:~$ 
            
            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #135

              Hi,

              Why are you pointing the plugin path to Qt Creator's installation rather than the Qt version you used to build your application ?

              By default you should not even need to use that variable.

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

              M 1 Reply Last reply
              0
              • SGaistS SGaist

                Hi,

                Why are you pointing the plugin path to Qt Creator's installation rather than the Qt version you used to build your application ?

                By default you should not even need to use that variable.

                M Offline
                M Offline
                mywings19
                wrote on last edited by
                #136

                @SGaist
                Me?That might be the problem

                When I point the Qt plugin path, 'xcb' couldn't be found
                sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test
                qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
                This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                Available platform plugins are: linuxfb, minimal, offscreen, vnc.

                So shall I reinstall the Qt or add some plugins?
                Thank you

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #137

                  Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                  M 1 Reply Last reply
                  1
                  • SGaistS SGaist

                    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

                    M Offline
                    M Offline
                    mywings19
                    wrote on last edited by mywings19
                    #138

                    @SGaist said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                    Start your application with the QT_DEBUG_PLUGINS environment variable set to 1 to see why the loading fails.

                    I've set the QT_DEBUG_PLUGINS environment variable in the .bashrc file and sourced it. See floor.134
                    But these is no error message while loading qtcreator.

                    sugon@EC:~$ echo $QT_DEBUG_PLUGINS
                    1
                    sugon@EC:~$

                    1 Reply Last reply
                    0
                    • hskoglundH Offline
                      hskoglundH Offline
                      hskoglund
                      wrote on last edited by
                      #139

                      Hi, perhaps you are launching Qt Creator by double clicking on it?
                      If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

                      M 1 Reply Last reply
                      0
                      • hskoglundH hskoglund

                        Hi, perhaps you are launching Qt Creator by double clicking on it?
                        If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

                        M Offline
                        M Offline
                        mywings19
                        wrote on last edited by
                        #140

                        @hskoglund said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                        Hi, perhaps you are launching Qt Creator by double clicking on it?
                        If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

                        Thank you, but I always start qtcreator in terminal. It can be seen in floor.134

                        sugon@EC:~$ source ~/.bashrc
                        sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
                        sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test

                        There's no error message until I closed the software.

                        JonBJ 1 Reply Last reply
                        0
                        • M mywings19

                          @hskoglund said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                          Hi, perhaps you are launching Qt Creator by double clicking on it?
                          If so, instead try starting Qt Creator from the same Terminal window that has QT_DEBUG_PLUGINS set to 1.

                          Thank you, but I always start qtcreator in terminal. It can be seen in floor.134

                          sugon@EC:~$ source ~/.bashrc
                          sugon@EC:~$ ~/Software/qtcreator8.0.1/bin/qtcreator
                          sugon@EC:~$ ~/QtProject/build-Test-Qt_6_3_1_in_PATH_Qt6_3_1-Debug/Test

                          There's no error message until I closed the software.

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #141

                          @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                          There's no error message until I closed the software.

                          In that case when does the message you showed earlier:

                          qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
                          This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                          Available platform plugins are: linuxfb, minimal, offscreen, vnc.
                          

                          appear? Not until after you close Creator? Interesting.....

                          M 1 Reply Last reply
                          0
                          • JonBJ JonB

                            @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                            There's no error message until I closed the software.

                            In that case when does the message you showed earlier:

                            qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
                            This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                            Available platform plugins are: linuxfb, minimal, offscreen, vnc.
                            

                            appear? Not until after you close Creator? Interesting.....

                            M Offline
                            M Offline
                            mywings19
                            wrote on last edited by mywings19
                            #142

                            @JonB said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                            @mywings19 said in qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.:

                            There's no error message until I closed the software.

                            In that case when does the message you showed earlier:

                            qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "/home/sugon/Software/Qt6.3.1/plugins/platforms/"
                            This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                            Available platform plugins are: linuxfb, minimal, offscreen, vnc.
                            

                            appear? Not until after you close Creator? Interesting.....

                            This 3 line message is showed when I build and run a test project.
                            I mean after I set QT_DEBUG_PLUGINS to 1, There's no extra error message except this 3 line when I start qtcreator or run project in terminal.

                            Now, I've uninstall the Qt and qtcreator,then installing by online installer.

                            1 Reply Last reply
                            0
                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #143

                              Is that a custom Qt build ? Because from the looks of it, the plugin is indeed not there.

                              Interested in AI ? www.idiap.ch
                              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                              1 Reply Last reply
                              0
                              • B Offline
                                B Offline
                                BenyaminZojaji
                                wrote on last edited by
                                #144

                                In my case, I just upgrade PyQt5 to PyQt6 and that works.

                                1 Reply Last reply
                                0
                                • T trimixotun

                                  It's looks slightly outdated, but maybe it someone helps:

                                  1. Debian 10 x86-64.
                                  2. LXDE
                                  3. Fresh net install Qt 5.12.10

                                  Qtcreator first launch problem: "qt.qpa.plugin: Could not load the Qt platform plugin "xcb"".

                                  Nothing from above helps at all. Qtcreator needs libxcb-util.so.1, but system has only libxcb-util.so.

                                  Simple solution:

                                  sudo ln -s /usr/lib/x86_64-linux-gnu/libxcb-util.so /usr/lib/x86_64-linux-gnu/libxcb-util.so.1

                                  All work, folks.

                                  G Offline
                                  G Offline
                                  GEZawaTT
                                  wrote on last edited by
                                  #145

                                  @trimixotun this worked!! Thank you so much!

                                  1 Reply Last reply
                                  0
                                  • 3 Offline
                                    3 Offline
                                    3mad
                                    wrote on last edited by
                                    #146

                                    In my case, I had the issue when installing ParaView, things fixed by installing the libxcb-xinput0 package:
                                    sudo apt-get install libxcb-xinput0

                                    Then, things work fine.

                                    1 Reply Last reply
                                    0
                                    • R Offline
                                      R Offline
                                      roux.benoit
                                      wrote on last edited by
                                      #147

                                      Hi,

                                      I know this is an old post, but I have the same issue that comes up when I'm setting some path for the LD_Library_path.

                                      for the context i'm creating a container that run an app with a gui using pyqt5, which works perfectly.

                                      However, I also need to install matlab runtime and after I set up Matlab runtime environement path :

                                      LD_LIBRARY_PATH=/opt/mscr/v912/runtime/glnxa64:/opt/mcr/v912/bin/glnxa64:/opt/mcr/v912/sys/os/glnxa64:/opt/mcr/v912/sys/opengl/lib/glnxa64

                                      the gui stops working and I get the "qt.qpa.plugin ..." error message.

                                      Any thoughts?
                                      Thanks a lot

                                      SGaistS 1 Reply Last reply
                                      0
                                      • R roux.benoit

                                        Hi,

                                        I know this is an old post, but I have the same issue that comes up when I'm setting some path for the LD_Library_path.

                                        for the context i'm creating a container that run an app with a gui using pyqt5, which works perfectly.

                                        However, I also need to install matlab runtime and after I set up Matlab runtime environement path :

                                        LD_LIBRARY_PATH=/opt/mscr/v912/runtime/glnxa64:/opt/mcr/v912/bin/glnxa64:/opt/mcr/v912/sys/os/glnxa64:/opt/mcr/v912/sys/opengl/lib/glnxa64

                                        the gui stops working and I get the "qt.qpa.plugin ..." error message.

                                        Any thoughts?
                                        Thanks a lot

                                        SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #148

                                        @roux-benoit hi,

                                        Check whether there's Qt libraries in your matlab installation.

                                        Interested in AI ? www.idiap.ch
                                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                        1 Reply Last reply
                                        0
                                        • P Offline
                                          P Offline
                                          phil-lipp
                                          wrote on last edited by
                                          #149

                                          I hope someone on this forum can help me. I'm trying to use Howdy (https://github.com/boltgolt/howdy), but I get the error described by OP.
                                          I only get the error when I use su -, however when I use plain su (without the -) it works. So I think i somehow messed up the install when I forgot to add the -... how can I fix this?

                                          the error:

                                          qt.qpa.xcb: could not connect to display 
                                          qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
                                          This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                                          ``
                                          JonBJ 1 Reply Last reply
                                          0

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