QXcbConnection: Could not connect to display :0 (solved)



  • I cannot start QTcreator
    @
    under /opt/Qt/Tools/QtCreator/bin
    ./qtcreator
    Error: could not initialize GLX
    Aborted (core dumped)

    when i sudo su
    under /opt/Qt/Tools/QtCreator/bin
    sudo ./qtcreator
    No protocol specified
    QXcbConnection: Could not connect to display :0
    Aborted (core dumped)

    Answer is in the link below
    https://harishnavnit.wordpress.com/2014/03/06/removing-nvidia-x-drivers-to-solve-the-glx-error/



  • [quote author="houmingc" date="1420514021"]I cannot start QTcreator
    @
    under /opt/Qt/Tools/QtCreator/bin
    ./qtcreator
    Error: could not initialize GLX
    Aborted (core dumped)
    [/quote]
    Sounds like broken opengl drivers.
    Have you made any changes in the system that may cause to break GLX?
    Do you run it in virtual machine?

    [quote author="houmingc" date="1420514021"]
    when i sudo su
    under /opt/Qt/Tools/QtCreator/bin
    sudo ./qtcreator
    No protocol specified
    QXcbConnection: Could not connect to display :0
    Aborted (core dumped)
    [/quote]
    Superuser does not have access to XWindow of a regular user unless you enable it using "xhost +" command.



  • Another option.
    Is it possible that you were logged into remote machine with X11 forwarding disabled?


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