In this tutorial, we will help you enable automatic login on Ubuntu 11.10 (Oneiric Ocelot), this is applicable if LightDM is used as the default display manager. Enabling automatic login, will help you avoid submitting your user password whenever you reach the login screen. Here are the instructions:
1. In the system tray, click your username and select User Accounts.
2. Click the Unlock button.
3. Click the Automatic Login button to switch it on and close the window.
4. Restart now your system to test if it works. That's it!