The virtualmin entries were disabled when the upgrade was attempted and the issue here is the one I described in comment number 2.
2014-04-21 17:56:00,362 DEBUG examining: 'deb http://software.virtualmin.com/gpl/ubuntu/ virtualmin-precise main' 2014-04-21 17:56:00,365 DEBUG entry '# deb http://software.virtualmin.com/gpl/ubuntu/ virtualmin-precise main # disabled on upgrade to trusty' was disabled (unknown mirror) 2014-04-21 17:56:00,365 DEBUG examining: 'deb http://software.virtualmin.com/gpl/ubuntu/ virtualmin-universal main' 2014-04-21 17:56:00,367 DEBUG entry '# deb http://software.virtualmin.com/gpl/ubuntu/ virtualmin-universal main # disabled on upgrade to trusty' was disabled (unknown mirror) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1310816 Title: 12.04.04 upgrade to 14.04 didnt work due to an unofficial mirror To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1310816/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs