I tried upgrading my Toshiba Satellite laptop with NVidia graphics card from 11.04 to 11.10 - it hung and failed, so I reinstalled from scratch as I had no other choice.
When the system boots, it just sits on the black screen saying "disconnected from plymouth". I've done Ctrl-Alt-F1 and can access the command line without any problems - I tried doing startx from there but it just says something to the effect of nv module not found.
I uninstalled and reinstalled the nvidia-current driver, made no difference. Also tried dpkg-reconfigure lightdm, and chose gdm. This worked sort-of, but I can't log in - no matter what I choose (unity, unity2d, gnome) it flashes to a black screen, then back to the login window.
Anyone have any ideas? I can't put up with using Windows for much longer!