You are welcome. I wasn't sure indeed if it was the right fix, but it did the job for my upgrade. If you have a link to it, I would be interested to check your modification also for my own curiosity.
About your question, the upgrader complained about the 404 errors on the console logs. I copied them from there and figured out that something was wrong regarding the choice of the server. Is this what you were wondering? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1917220 Title: ports.ubuntu.com not selected for arm64 architecture To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1917220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs