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Since upgrading to 13.04, I cannot get Unity to start.

Running unity_support_test -p yields the following messages:

Xlib: extension "GLX" missing on display ":0"
Error: GLX is not available on the system

Is there a solution to this problem?

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The update probably broke compatibility for your graphics card. Do you know how to unistall/install the proprietary drivers? –  Leinardo Smith Aug 8 '13 at 21:52
    
Similar question was already asked. Try to look here: askubuntu.com/questions/67567/extension-glx-missing-on-display –  piotrektt Aug 8 '13 at 21:53
    
I am not familiar with the uninstallation of proprietary drivers... –  Carroll Aug 9 '13 at 3:10
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