[ubuntu] 12.04 LTS Guest Account

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http://ubuntuforums.org – OK, I just upgraded & @ 1st wasn't sure if I'd like the new layout. Seems cool, though...I'm gettin familiar now. However, I do not like the fact that my computer can be turned on and logged into on guest account. Can I change this to where an admin has to login to 'grant' access to Guest, like before in 10.04 LTS? If so, how? Thanks (Hardware)