I checked in /var/log/dist-upgrades/apt.log and it was getting confused by gnuplot, gnuplot-x11 and gnuplot-nox. I don't remember why I ever installed gnuplot, so I uninstalled them and the upgrade can now be calculated
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1069160 Title: Could not calculate the upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1069160/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
