stop & start GUI on UBUNTU

*GNOME desktop

If you are using GNOME:

sudo /etc/init.d/gdm stop

Again to start GNOME desktop:

sudo /etc/init.d/gdm start

*KDE desktop

sudo /etc/init.d/kdm stop

sudo /etc/init.d/kdm start

you can use the init command to go immediately into runlevel 1, which is also known as single user text mode. Open terminal and type the following command:

sudo init 1

Again get back to GUI Mode with init 2 command:

sudo init 2

note:

runlevel 1 was single user, 3 was multi-user and 5 was GUI.

sudo telinit 3

more help here->http://theos.in/news/ubuntu-linux-shutdown-the-x-server/

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