Try running this and see if it clears the problem:
sudo rm
/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages
---
Ubuntu Bug Squad volunteer triager
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** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/874673
Title:
bug against the 'update-manager' package
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