Thanks for the reply. I did spend some time searching and trying things before asking here.
Your suggestion “sudo modprobe quota_v2” didn’t appear to help.
I might have to try replicating my production server using the Vmin installer 7.0.2, as it appears there have been some issues with the recent versions.
I think this might be the key but I am not sure what it is pointing to.
“mount: (hint) your fstab has been modified, but systemd still uses
the old version; use ‘systemctl daemon-reload’ to reload.”