Run the following and see if it clears up the problem:
sudo rm /var/lib/apt/lists/fi.archive.ubuntu
.com_ubuntu_dists_natty_main_binary-i386_Packages
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/777602
Title:
problem upgrading to 11.04 E:Encountered section with no Package...
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