I had the same problem. I carefully pruned away all PPAs and the software installed from them. I did this by using software-properties- gtk and disabling all the repositories in 'Other Software' and then using aptitude to delete all packages in 'Obsolete or Local Packages'. However, this did not help.
While digging around in /var/log/dist-upgrade/apt.log (or was it main.log?), I saw that there were some packages that were identified as 'meta packages' and there were dependency resolution issues with some of these. These were: xubuntu-desktop ubuntu-unity-desktop ubuntu-gnome-desktop kubuntu-desktop ubuntu-budgie-desktop ubuntu-mate-desktop lubuntu-desktop Since I only need 1 of these to have a working system after the upgrade, I deleted them (except kubuntu-desktop and ubuntu-unity-desktop, I think), upgraded and then re-installed them. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1852006 Title: Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1852006/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
