First you should remove the old driver and reboot. You’ll need this script to install it.
sudo apt-get remove fglrx fglrx-amdcccle
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.old
sudo rm -fr /usr/lib/fglrx
sudo rm -fr /etc/ati
sudo reboot
If you don’t have any ATI driver installed then skip the above.
Type ctrl alt f1, then do the below after you login.
wget http://kanotix.com/files/install-fglrx-debian.sh
chmod 755 install-fglrx-debian.sh
sudo ./install-fglrx-debian.sh -z
sudo aticonfig -f --initial
sudo reboot
If the script isn’t updated for the latest ATI version, then you can run it with -v 10-6 (10.6 is the latest as of writing this.).
sudo ./install-fglrx-debian.sh -zv 10-6
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