Compiz bails when I try to run it:

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

Compiz (opengl) - Fatal: Root visual is not a GL visual

Compiz (bailer) - Info: Ensuring a shell for your session

I have no idea why. It was working without a hitch, and one day, I realized compiz wasn't running. I tried to run it and the above message is what I got in reply. I looked under the menu, and saw some Nvidia program, so I ran it and it told me I wasn't using the nvidia driver and to run sudo nvidia-xconfig.

I ran it and it created /etc/X11/xorg.conf that wasn't there before. Upon restarting X, it complained that "nvidia" did not exist. [the driver] So, I've asked on ubuntuforums, and got no replies.

I figured I'd try here before I reinstall Ubuntu again. [Just upgraded from 10.10 to 11.04 a little while ago--it was working fine on both versions, it just started to quit working on 11.04 recently]

Edit:

matt: ~ $ lspci |grep VGA

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c)

In Additional Drivers, there is only 1: my WiFi driver, and it is activated.