[ubuntu] Software center no available

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http://ubuntuforums.org – Hello, I recently had to reinstall 12.04. All seems to have gone well, but after installing a few apps - afew days later I have no apps. The icon is still in the launcher. Click on it and I get a blank page (heading 'software center'). Click on the 'x' to close and nothing happens. even left click on the title bar and still nothing. Reinstall was the result of unwise messing with Compiz. Any help will be appreciared thanks. (Hardware)