That isn’t clear yet. Waiting for more replies before passing judgement. There are two issues, both of which started after upgrading dom0. It might be similar to Root access fails on templates, causing qubes-dist-upgrade error - #2 by ephile. I will check when I have time. But the fact that the error is so similar makes me feel better that it’s not user error.(despite what @barto suggested above). (It would be hard for it to be user error. There’s not enough interaction for that to be true.)
And it’s still notable that it started immediately after a dom0 upgrade. Are there release notes for the most recent dom0 upgrade, which I could read?
Feel free to actually participate in the discussion by providing troubleshooting steps. Then I can provide that “oher input” .