update manager Could not initialize the package information (while updating from 11.4 to 11.10)

Every time I open my update manager I get this 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/eg.archive.ubuntu.com_ubuntu_dists_natty_multiverse_i18n_Translation-en, E:The package lists or status file could not be parsed or opened.'
___________________________________________________________________________

after I tried updating from 11.4 to 11.10 and failed