I was experimenting with Gnome 3.6 13.04, when I decided to install 'ubuntu-gnome-desktop' and 'ubuntu-gnome-default-settings', to further enhance my experience. Using synaptic to do so, all went smoothly. Closed out of the app, then proceeded to reboot my PC.

My PC screen went darker, and after a few moments I was re-offered the option to restart my PC. I chose yes, then waited a few more moments and nothing happened. So I did a manual switch off.

Now, when I restart, I get this message:

GNU GRUB version 2.00-13ubuntu2

Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device or file completions.


What do I do next to get this booting properly again??