*** This bug is a duplicate of bug 1896380 *** https://bugs.launchpad.net/bugs/1896380
You still have packages from oibaf PPA installed and they are interfering with the upgrade. I see in your other bug report, you had an issue with ppa-purge. You have to solve that first. ** This bug has been marked a duplicate of bug 1896380 An unresolvable problem occurred while calculating the upgrade. 18.04 to 20.04 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1896386 Title: An unresolvable problem occurred while calculating the upgrade. 18.04 to 20.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1896386/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs