I have 11.04 installed with Gnome 3 and everything was working fine until I tried to run the update manager. Now I can't update any of my packages. A similar question was posted awhile ago but no solution was presented
Edit
Output from sudo apt-get update && sudo apt-get upgrade
Ign http://extras.ubuntu.com natty InRelease
Ign http://ppa.launchpad.net natty InRelease
Ign http://us.archive.ubuntu.com natty InRelease
Ign http://us.archive.ubuntu.com natty-updates InRelease
Ign http://security.ubuntu.com natty-security InRelease
Hit http://extras.ubuntu.com natty Release.gpg
Hit http://ppa.launchpad.net natty Release.gpg
Hit http://us.archive.ubuntu.com …