How do we fix it?
There is simple fix for this issue. Once you get the error on your screen press ALT+CTRL+F1, once in new screen type/run these commands
sudo apt-get update sudo apt-get purge flglrx sudo reboot
The message should be gone, if not there is good chnage that you have also trouble with gdm and you can fix it in these steps:
Again press ALT+CTRL+F1 and run these commands
sudo apt-get install gdm sudo service gdm restart
