Install linux-restricted-modules and restricted-manager provied in the restricted repositories:
sudo apt-get update
sudo apt-get install linux-restricted-modules-generic restricted-manager
Open the restricted drivers manager included in 7.04 “System -> Administration -> Restricted Drivers Manager” and select “ATI accelerated graphics driver”.
Original guide from Ubuntu documentation that solved my problem 
November 13th, 2007 - 6:47 pm
hope it works ^^
January 22nd, 2009 - 10:04 am
thnks
January 22nd, 2009 - 10:04 am
thank hope it woks