[ubuntu] Error in 12.10 upgrade

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/archive.canonical.com_ubuntu_dists_quantal_partner _binary-i386_Packages, E:The package lists or status file could not be parsed or opened.