FWIW I did eventually (ok, probably about two days later) go ahead and do the upgrade at the terminal using sudo do-release-upgrade, and that went fine. But it makes me unavailable to test a fix.
FWIW I did eventually (ok, probably about two days later) go ahead and do the upgrade at the terminal using sudo do-release-upgrade, and that went fine. But it makes me unavailable to test a fix.