I don’t really get how there are a bunch of different passwords in Ubuntu so when I decided to change my password to something a little less arduous to type, I ran into some problems because I ended up changing my password for some things but not for others and my computer started acting weird (e.g. demanding a password to get a wireless connection). Here are two links that will help you if you are in the same predicament.

http://www.codetorment.com/2009/11/03/tutorial-change-user-password-in-ubuntu-9-10/

http://ubuntuforums.org/showthread.php?t=1314488