[ubuntu] Update Manager Not Working

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http://ubuntuforums.org – An unusual situation has happened to my computer. There seems to be a bug with the "update-manger" package. When I click on the "Software Up to Date" botton, I get the following error message: <<Could not initialize the package information An unresolvable problem occurred while initializing the package information. Please report this bug against the 'update-manager' package and include the following error message: 'E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise_multive rs (Hardware)