Thanks for reporting this bug and help in making Ubuntu better, and sorry for the long time without an answer. According to the logs you provided, it seems that what broke your upgrade was a dependency problem in gnuplot. It this is still an issue for you please mark the status of the report back to "new", otherwise please kindly disregard this message.
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1068505 Title: installArchives() failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1068505/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs