I usually install my Ati drivers like this on Debian 64bit, and have just found out today that it’s the same for Kubuntu 64bit as well
1. Download Ati driver:
2. Get all needed files and headers
sudo apt-get install module-assistant
3. Remove (completely) fglrx drivers (If you have them installed):
sudo apt-get remove –purge fglrx
5. Go to console
Ctrl + Alt + F1
6. Login as Root and kill X
7. Unzip and run the Ati driver installer
*NOTE* You can also run the installer from desktop terminal as well, but I always do graphic driver installs from the console with no X.
8. Configure X as root
cp xorg.conf.new /etc/X11/xorg.conf
Thar she blows !!!!!