Xserver Restart Start or Stop

Ctrl + Alt + Backspace does not work with later versions of Ubuntu, at least on 10.04

Here is how to do it

Press Crl + Alt + 2
Login as admin

#> sudo bash

(Use kdm instead of gdm below if your installation is kubuntu)

To restart gdm

#> /etc/init.d/gdm restart

To start gdm

#> /etc/init.d/gdm start

To stop gdm

#> /etc/init.d/gdm stop