The root-cause for my dist-upgrade problem seems to be this: https://wiki.ubuntu.com/FocalFossa/ReleaseNotes
Quote: "Users of the i386 architecture will not be presented with an upgrade to Ubuntu 20.04 LTS. Support for i386 as a host architecture was dropped in 19.10." :-( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890936 Title: trying upgrade 18.04.5 to 20.04.1 - "There is no development version of an LTS available." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1890936/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs