First off I did something stupid. I downloaded a Nvidia driver even though I have an integrated chipset. After installation my unity was still working. However, when I restarted my computer I got an error message saying that I can't run unity.

I uninstalled the Nvidia driver.

I restarted my computer.

Unity still does not work.

In the terminal I type "unity" and everything looks okay until I get three error messages that say this:

Xlib:  extension "GLX" missing on display ":0.0".

followed by:

Compiz (opengl) - Fatal: glXCreateContext failed
Compiz (bailer) - Info: Ensuring a shell for your session
jesse@jesse-PC:~$ Cannot register the panel shell: there is already one running.
  • This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. :)
    – fossfreedom
    Feb 24 '12 at 14:09

Logout and, before log back in, make sure to choose Ubuntu instead of Ubuntu Classic.

  • Didn't work desgua. I ran it in the terminal then tried "unity" and it came up with same errors.
    – Jesse
    Sep 2 '11 at 0:41
  • Can you get to a graphical environment?
    – desgua
    Sep 2 '11 at 0:51
  • I am working in ubuntu now as selected when I logged on.. same as I always have.. it just looks different. I cannot manage windows like I used to and there is no sidebar.
    – Jesse
    Sep 2 '11 at 1:11
  • Run jockey-gtk to see if a driver can be installed to enable 3d acceleration.
    – desgua
    Sep 2 '11 at 1:23
  • If it doesn't help, you can try to logout and, before log back in, make sure to choose Ubuntu instead of Ubuntu Classic.
    – desgua
    Sep 2 '11 at 1:24

You need to install the mesa-glx package.

sudo apt-get install libgl1-mesa-glx libgl1-mesa-dri

Then, restart, and you should be fine.


first of all check if you have completely removed nvidia drivers

then install intel-gpu-tools and i965-va-driver

sudo apt-get install intel-gpu-tools
sudo apt-get install i965-va-driver

I hope this should work

you may need to reinstall unity and logout for change in effects

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