This is likely because you have python2 packages installed from a PPA. You'll want to remove those python2 package and try the upgrade again. These are some of the packages from the PPA.
python2 2.7.15-3~oibaf~b 1 python2-minimal 2.7.15-3~oibaf~b 1 The following page contains instructions about how to upgrade if you have this PPA enabled: https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874549 Title: 20.04 is not getting updated from 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1874549/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
