[ubuntu] software center

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http://ubuntuforums.org – Hi all, Although I am not an absolute beginnerI feel as though I am when I have a problem I can't fix and this is my problem: When I log into the software center( in Ubuntu) and download an app or program, my computer will freeze up, multi colored horizontal lines will appear across the screen and I have to reboot manually. very frustrating I was hoping someone can help me solve thsi problem. Thank you,R howard (Hardware)