I forgot the password I used for authorizing programs and actions on my comp and so i tried to reset it using http://psychocats.net/ubuntu/resetpassword but it didn't work it kept saying "Authentication token manipulation error". What should I do next? my login still works fine and I've tried to guess and guess my authentication password but I just can't remember. Another problem I was having when I did remember my password was that all of a sudden after a few months I couldn't get any programs to install via the software center, there would always be an error. The update manager stopped updating too due to an error as well. please help me thanks :) I'm using ubuntu 11.10 32bit.