[ubuntu] Repair Broken Packages - Ubuntu 12.04

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http://ubuntuforums.org – Hey guys, I had a fresh installation of Ubuntu 12.04 x64 and after installing Gfx Card Drivers, I tried installing Ubuntu-Restricted-Extras, which due to lack of time, I cancelled in between. Now, I'm getting this error when I try to install anything. Actually, I did try with force install/upgrade option, but that error won't go away. I am not able to install mp3 codecs of my player due to this. When I open "Ubuntu Software Center", I get error message saying "Items can not be installed or removed, until your catalog is repaired. Do you want to repair it now?" when I cl (Hardware)