How To Disable Guest Account In Ubuntu 12.04

As you know guest account is a password less account in ubuntu.By default guest account is enabled in ubuntu 12.04.Using this guest account unauthorized persons can access our computer.Follow these steps to remove guest account from ubuntu.
Goto terminal  and type the following command and press enter
gksudo gedit /etc/lightdm/lightdm.conf

Copy paste the sentence to the file and save the document
Now restart lightdm using the following command ( all graphical user interfaced programs will be terminated)
sudo restart lightdm

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