Translated from Google:
I have a radeon hd6670 and have not found how to make it work properly. Just install the OS and the screen is flashing purple. So I am only able to enter in safe graphics mode. Once there I tried everything:
Activated drivers that Ubuntu automatically detects from Additional Drivers, as a result it enters the desktop but it is all frozen, I can move the mouse but I can not interact with any icon.
I installed the drivers manually with guidance http://wiki.cchtml.com/index.php/Ubuntu_Precise_Installation_Guide and the result was the same as in the previous case.
Prove to the oneiric 11.01 Guide Installation Guide on the same page and again on desktop frizz
Finally installed the version 11.04 of the result http://wiki.cchtml.com/index.php/Ubuntu_Natty_Installation_Guide
The desktop looks and works but I have no 3D acceleration, I can not use Unity3D and all programs like POL give me error saying I have installed the wrong graphics
It is the first time I installed Ubuntu and I really like the OS, I do not want to reinstall windows if I can lend a hand I will thank you.