@Chris: Thank you for your suggestion; I will go to those sites and inquire further.
Nevertheless, when the release upgrade process was terminated, the terminal output did include the recommendation to "please report this bug." I presume that this recommendation was put there so that the maintainers may be able to identify potential issues that may correct this kind of behaviour in the future. If I find from elsewhere that it was somehow my fault that this is happening, I will gladly return here to mark this bug as "Invalid" but, for now, I am assuming that this behaviour is due to some error in the software since the cause is not at all obvious. In any case, I am willing to defer the "nuclear option" (i.e. re-install the OS) until a definite cause of the issue can be found. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1920829 Title: do-release-upgrade fails complaining of held broken packages that apt- get upgrade or dist-upgrade does not report To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1920829/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs