How to disable 'Guest Session' in Ubuntu 12.04

At the booting option a guest session is allowed to run Ubuntu 12.04 desktop. But sometimes we do not want to allow anybody to login at office as a guest or not. So you might want to disable 'Guest Session' in Ubuntu 12.04. Today we will know how to disable 'Guest Sessions' at Ubuntu 12.04 startup.

At first run the command below at 'Terminal'.

sudo gedit /etc/lightdm/lightdm.conf

The "lightdm.conf" file will open. Now add the line below at the end of this file.

allow-guest=false

You have done disable 'Guest sessions' at Ubuntu 12.04 start up. Want to check it? Just restart your system and try to find.