[ubuntu] lost ability to sudo ... now this

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http://ubuntuforums.org – Lost the ability to sudo. So I put in a liveCD and mounted the partition and made the edits to the /etc/sudoers file that way. The changes saved and I now have the ability back to sudo. But I lost the ability to choose which userid to install gui with. I only get the ability to enter the root password as where I should have the choice box between my users. http://imgur.com/hiVDt (Hardware)