I just installed Ubuntu 12.04. Then I changed my own user profile to not require a password and log me in automatically. What happened is, I'm still asked for a password once the desktop diplays. Once I'm in, I find my password is not accepted when I'm trying to install an application or make changes to user accounts.
I'm still listed as an administrator, so I figure something must have happened to my password. My question is, why is my password accepted for logging in as a user, but not to do administrator stuff? It's the same password, isn't it? The one I set when I installed Ubuntu.
I tried resetting the password at the root shell prompt (accessed via recovery mode), but I only get an error, with the result "Password unchanged".
Help! Is there something else I can do to avoid completely reinstalling Ubuntu?