It seems that you only disabled / removed the PPA's from your apt sources, because the packages from them are still installed the upgrade was not able to be calculated. You'll need to reenable the PPAs and use the tool ppa-purge to remove the packages provided by the PPAs and disable them.
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1899859 Title: Could not calculate upgrade to Ubuntu 20 due to failure to remove python-minimal To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1899859/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs