The upgrade is not calculatable because you have nodejs installed from some other than the official Ubuntu archive and it provides a version of the package greater than the one in the official Ubuntu archive. Additionally, it depends on python-minimal which is no longer available in the Ubuntu archive for 20.04. You'll need to manually sort out this situation likely by removing the nodejs package.
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Invalid ** Summary changed: - Try to upgrade to 20.04 + cannot upgrade to 20.04 due to non-official nodejs -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1875052 Title: cannot upgrade to 20.04 due to non-official nodejs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1875052/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs