I installed Ubuntu 9.10 3 days back and things worked fine. I have dual boot setup and GRUB loads properly.
Yesterday, I tried upgrading the proprietary nVIDIA 3D graphics drivers from 173 to 185 (recommended). The installation failed and I didn't think much of it.
When I booted into Ubuntu later, I got a flashing screen asking for my login. This was in the command prompt. So the graphical interface did not show up.
When I try typing, it sometimes recognizes the keystroke and sometimes does not. So, entering my password is impossible.
I am a novice about all things Linux so any help will be greatly appreciated.