When I tried it, I got the following error: authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' Authentication failed Authenticating the upgrade failed. There may be a problem with the network or with the server.
I managed to track down version 20.04.33 of focal.tar.gz on archive.ubuntu.com, downloaded and decompressed it, and ran it, and am pleased to say the upgrade has worked. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1928555 Title: Upgrade from 18.04 LTS fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1928555/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs