I fixed this error by typing the following command into a terminal: sudo rm /var/lib/apt/lists/* -vf sudo apt-get update
I got the fix from http://www.askubuntu.com/questions/30072 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1043670 Title: update manager not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1043670/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs