Fixed. Followed the instructions from RhizomaticNomad from upgrade from 4.0 to 4.1 breaks dom0 update -- [ERROR ] Failed to import module localemod · Issue #7114 · QubesOS/qubes-issues · GitHub from Dom0 update fails after 4.1 upgrade
in Global settings → Default kernel used by qubes was pointing to 5.4 from fc25, changed that to 5.10.109-1.fc32.
sudo dnf remove qubes-mgmt-salt-base-overrides(not necessary, because it wasn’t installed (anymore?))qubesctl saltutil.clear_cache qubesctl saltutil.sync_allAfter this, the Dom0 could be updated again.
That’s all I did (even no reboot).
Best regards,
Ivan