Run: sudo rm /var/lib/apt/lists/partial/security.ubuntu .com_ubuntu_dists_oneiric-security_main_binary-i386_Packages
See if it clears the problem. ** Changed in: update-manager (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/885659 Title: W:Failed to fetch gzip:/var/lib/apt/lists/partial/security.ubuntu .com_ubuntu_dists_oneiric-security_main_binary-i386_Packages Hash Sum mismatch , E:Some index files failed to download. They have been ignored, or old ones used instead. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/885659/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs