Display issue - Xlib: extension "GLX" missing on display ":0"



  • Hello there!

    I have just begun using Qt after quite a break and meanwhile I have changed the OS from Windows to Ubuntu. I am currently using Ubuntu 12.04 LTS.
    I tried writing a test Qt GUI App(one that shows the sum of two numbers) and it worked up to a certain point.
    When I run the app, the following message occurs,
    Xlib: extension "GLX" missing on display ":0".

    When I try to click the SumUpButton, instead of displaying the result in the label I want, there is a rectangle displayed in the label I was telling you about.

    Please help me solve this problem.

    Thank you!
    Radu


  • Moderators

    Qt4 or Qt5? Might be that you are missing some dependencies (mesa).

    Please show us your code (just the part that matters).


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