It doesn’t seem like the quotas fork is maintained anymore.
I would suggest not using it this point and time. It’s been over a year with no updates or merging.
I have asked John what the status of the project is in the github issues tracker: v64 · Issue #23 · jrsupplee/mailinabox · GitHub
I know that Ubuntu 22.04 LTS isn’t supported yet with the quotas fork and I’m not sure anyone should consider installing a fresh copy of 18.04 LTS.
Perhaps More power to Mail-in-a-box (fork showcase)
would be an alternative. @davness This supports Ubuntu 22.04 right? I think even this project is way behind v65 of the overall project.
Honestly I wish this project would just support quota’s natively. ( but I get that everyone is working here just to maintain what we have, so thank you )