How to enable automatic/user login screen in ubuntu (10.04).
1) Click on System -> Administration -> Login screen.
2) New window will appear then click on unlock button.
3). it will ask authentication-- enter password for login.
4). in that window you can choose 3 option.
- Paly login sound.
-Show the screen for choosing who will login.
-Log in as (userName) automatically.
5) Then click on "Log in as (userName) automatically".
The prompt of authentication Password are showing below.