Run this and see if it clears the problem:
sudo rm
/var/lib/apt/lists/cm.archive.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages
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http://wiki.ubuntu.com/BugSquad
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/884781
Title:
download manager shows (E:Encountered a section with no Package:
header, E:Problem with MergeList /var/lib/apt/lists)
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