I have been running 12.04 for a number of years now without any issues, using the update manager whenever it showed that there were updates. Recently, I ran update manager and it took forever to run. It appeared to be updating/installing nvidia-304 although I already had 319 installed. After the update, it requested a reboot, after which I was presented with a command line screen. I have tried purging nvidia packages uusing "sudo apt-get purge nvidia*" and then rebooting. This gives me back a graphical display, but there is no nvidia installed so I can't use nvidia-settings to change the resolution. Every time I use some of the suggestions from this forum to re-install nvidia drivers, I end up with the text-only command line screen again. HELP!!!