Looks like libhdf5-serial-1.8.4 is the offender. Its no longer available and apt wants to keep it rather than remove it (as it has this bias towards keeping stuff installed that is not ideal in a situation like this).
** Attachment added: "The apt log" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1308338/+attachment/4085169/+files/apt.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1308338 Title: Ubuntu 12.04 LTS -> 14.04 LTS upgrade fails if Flight Gear installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1308338/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
