Nope, never got it upgraded. Deleting the DB and restoring the backup sounds pretty risky. We need the upgrade in-place to work, basically.
We’re running ubuntu 18.04 which hits desupport in 2023 so I figure at that point we’ll have no choice but to migrate to a new host anyway, and plan to bite the bullet then, build-out a new host running 22.04 LTS, and restore from backup.