Try running this to see if it fixes the problem:
sudo rm
/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_natty-updates_main_binary-i386_Packages
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** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/876587
Title:
Oncelot upgrade from 11.04 update-manager fail
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