[ubuntu] 12.04 Problem/Questions

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http://ubuntuforums.org – Good afternoon, I recently updated my 10.04 release and then had a problem with the graphics card so I updated a little more and now have 12.04 which I'm fine with except that when I get to the login screen I can login as a guest and a secondary accout I have, but not as the main, administrator account. I tried to make it so no login was necessary and my password is accepted, but on the main login screen, after I put in my password I go right back to the main login screen. And where is the terminal to enter commands? (Hardware)