The problem is that you still have packages (nodejs) installed from a 3rd-party repository. Try removing nodejs and then attempt the upgrade again:
sudo apt-get purge nodejs sudo rm /etc/apt/sources.list.d/nodesource.list sudo apt-get update ** 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/1905534 Title: upgrade to ubuntu 20 fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1905534/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs