Talk:Troubleshooting
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I found that on my system (Ubuntu 10.04 LTS, upgraded from 9.10, using a Radeon 5850), it was necessary in Synaptic to deselect the ati related xserver-xorg-... packages (search for 'ati') and only selecting the fglrx driver and fglrx-amdcccle. I am using the closed source driver for multi monitor support, but when using this driver (either from Synaptic or downloaded from ati and installed by shell script), no graphic acceleration and/or peculiar artifacts occurred.