To clarify my last comment nautilus and unattended-upgrades both having a phasing percentage of 0 so won't appear in update-manager but are upgradable via apt so do-release-upgrade complains about not all updates being installed.
To clarify my last comment nautilus and unattended-upgrades both having a phasing percentage of 0 so won't appear in update-manager but are upgradable via apt so do-release-upgrade complains about not all updates being installed.