Works to remove FGLRX and install radeon drivers:
Code:
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.bak ##gets a no-longer needed file out of the way
sudo apt-get purge fglrx fglrx-amdcccle fglrx-updates fglrx-amdcccle-updates ##removes all the proprietary driver files
sudo apt-get install dkms ##cheap insurance - for installing supplementary versions of kernel modules (the driver is a module)
sudo apt-get install xserver-xorg-video-radeon ##the Open Source module it's self
sudo apt-get install --reinstall libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core ##just to make sure the related libraries and the xserver layer is clean and uncorrupted - the current version
sudo dpkg-reconfigure xserver-xorg ## just that, make the operating system forget the purged 'FGLRX' module, and pick up and use the new module(s) installed (radeon)
sudo update-initramfs -u ##again, cheap insurance, make sure the linux-image is rebuilt with the new libs and modules.