Try running this and see if it corrects the problem:
sudo rm /var/lib/apt/lists/us.archive.ubuntu
.com_ubuntu_dists_natty_restricted_binary-i386_Packages
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/782519
Title:
Could not initialize the package information. An unresolvable problem
occurred while initializing the package information.
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