Is there a way to kil xserver and put me into a command prompt or something? (Ubuntu 11.10)
Normally killing xserver with
sudo stop lightgdm puts me into a BIOS-esque black screen.
Where can I type but commands cannot be issued?
Hit Ctrl+Alt+F1 to get to a Virtual terminal. There are several more, from F1 to F6. F7 and F8 are usually used for running your X server and some messages.
Note that you need to login to those terminals first, before you can use them.
Have you tried Ctrl + Alt + F2 or F3 or F4? Then. you should be able to return to X with Ctrl + Alt + F8