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?
Running sudo apt-get remove fglrx results in:
Unable to write to /var/cache/apt
The package lists or status files could not be opened
I found this link which solved the problem for me. In summary:
Since Natty (11.04), Ubuntu will mount your root partition as read only, so you can’t make any change right away... To get Read Write, you need to run this in root shell:
mount -o remount,rw /
apt-get commands worked for me after that. I ran apt-get remove fglrx* and after rebooting the open-source drivers are being used.
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