amd-graphicsdriversfglrx
I installed ati-driver-installer-11-9-x86.x86_64.run downloaded from the ATI Website.
However I installed the generic version instead of building a distribution specific installer.
Now I have the gnome-shell graphic glitches that are associated with having the old Fglrx drivers installed.
How can I remove these drivers?
They do not show up in the additional drivers dialog, and I cannot install any other drivers till these are removed.
The 'post release updates' will install Catalyst 11.9 which is the latest version while the 'ATI/AMD proprietary FGLRX graphics driver' will install Catalyst 11.8 which was the driver at the freeze stage of 11.10 development
There has been issues with the 11.9 driver with Unity (see ubuntu forums here) so I suggest you install the 'ATI/AMD proprietary FGLRX graphics driver'.
Try running fgl_glxgears. If the driver is correctly installed, you should see an animation of a cube looking like this:
If you get an error, that means the driver is either incorrectly installed, or not installed at all. In order to install it, follow these instructions.
Best Answer
Run both this commands:
Plus refer to this site: ATI - Ubuntu Oneiric Installation Guide