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
allow-guest=false
Now restart lightdm using the following command ( all graphical user interfaced programs will be terminated)
sudo restart lightdm
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
allow-guest=false
Now restart lightdm using the following command ( all graphical user interfaced programs will be terminated)
sudo restart lightdm
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