This might have some to do with the fact that you have no desktop metapackage installed.
2014-12-21 17:09:36,207 DEBUG none of the '['ubuntu-desktop', 'kubuntu-desktop', 'xubuntu-desktop', 'ubuntustudio-desktop', 'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-desktop']' meta-pkgs installed 2014-12-21 17:09:36,207 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg Please try installing the one of your preference and then trying the upgrade again. Thanks! ** 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/1404660 Title: update from 12.04 to 14.04 via upgrade-manager -d called Ubuntu Desktop install fail message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1404660/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs