Public bug reported: kubuntu-devel-release-upgrade fails with the "Could not calculate the upgrade" message dialog, referring to an unresolvale problem while calculating the upgrade.
A manual apt-get dist-upgrade on the terminal suggests that the following conflict might be the reason perhaps? Calculating upgrade... Failed The following packages have unmet dependencies: tk : Breaks: tk8.5 (< 8.5.14-3) but 8.5.11-2ubuntu4 is to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. That said, aptitude seems to be able to determine an upgrade path. ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1286288 Title: Calculation of upgrade failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1286288/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs