I just updated to 14.04 from 12.04 and graphics performance was a bit choppy/sluggish (AMD/ATI Mobility Radeon 4xxx). There's so much information and advice about what to do in this situation that I felt lost, so I just decided to go ahead and try installing the fglrx drivers.
I did this from the software center and now every time I boot there's no display. The only thing I can use to interact with the system is the root shell prompt in recovery mode. Can anyone tell me how to roll back or uninstall those fglrx drivers?
sudo apt-get remove fglrx results in:
Unable to write to /var/cache/apt
The package lists or status files could not be opened