Ubuntu – Latest ATI drivers

There are two driver options that usually work well:

• the opensource radeon driver
• the fglrx package from the official repository

A 64-bit kernel usually gets much better support in this case.

You can also try the 12.6 beta drivers from AMD.

If you need a guide, try the Unofficial Wiki for the AMD Linux Driver.

Do not install a new driver package over an old one. Remember to uninstall the previous package(s).

Use

sudo apt-mark hold [linuxkernelpackage]

This will ignore upgrades/downgrades for that package.

Source: Exclude packages from `apt-get upgrade`