Some various tips for Ubuntu family users, including this auto-login tip:
By default, when you boot up the computer, Ubuntu will give you a login screen before you get to your X session. From a security perspective, this is a good idea, particularly in multi-user environments or in any situation where other people have physical access to your computer. Still, many users are used to just being logged in automatically, and don't want to fuss with logging in each time they reboot their desktop.
To set this in Ubuntu, go to System -- Administration -- Login Window. You'll need to provide your password, then you'll get the Login Window Preferences window with five tabs. Choose the Security tab and click Enable Automatic Login. If you have more than one regular user, make sure to specify which user should be logged in automatically.
Read full list here: Linux.com | Ten tips for new Ubuntu users