Your question is a duplicate of [How to get the GNOME 3 login manager installed?](http://askubuntu.com/questions/64797/how-to-get-the-gnome-3-login-manager-installed). The answer provided covers for 12.04 but it has its own issues. Proceed with caution.
– jokerdinoAug 18 '13 at 08:02
i had tried that post but i get stuck at login gdm is not loaded . so i had to reconfigure display manager to lightdm.
– Golden SinhaAug 18 '13 at 18:20