upgrading problems

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http://askubuntu.com – I get this problem when ever I tried to do update: 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/security.ubuntu.com_ubuntu_dists_precise-security_universe_binary-i386_Packages, E:The package lists or status file could not be parsed or opened. (HowTos)