[Bug 794247] [NEW] my update manager is not working anymore..

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May I first apologize as I am reasonably new to Ubuntu 11.04 & Linux and
I am not totally familiar with the Linux terms, as I am a recent convert
from Windows XP.

when i open update-manager, it shows me a message to report a bug...
then there is only option to close the update-manager, i'm not able to do anything...
it shows me a message to report with a bug is ::

'E:Encountered a section with no Package: header, E:Problem with
MergeList /var/lib/apt/lists/archive.ubuntu
.com_ubuntu_dists_natty_main_binary-i386_Packages, E:The package lists
or status file could not be parsed or opened.'

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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my update manager is not working anymore..
https://bugs.launchpad.net/bugs/794247
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