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I don't know why it's hard to understand that it shouldn't register ALT-GR as CTRL+ALT just register it simply ALT or a different type of ALT but not CTRL+ALT (or atleast put an option there).
What version of Ubuntu are you running ?
Did you test with the version of Qt Creator from Ubuntu's repositories ?
Try using the QMAKE_EXT_CPP qmake variable to have .c files treated as c++ files.
