Recently, I changed NFS mounts from hardmounts to systemd.automount.  I did this so that servers would recover NFS mounts automatically after reboot.

     I did not realize the time that this functionality in systemd did not work in Ubuntu 20.04.  We have this old server in place solely to server RoundCube mail because it is unmaintained software that will not function on newer installations.

     Since this facility did not work, mounts were lost after a reboot and did not automatically recover.  I have changed this one machine to use an older facility that serves a similar functionality but uses a dedicated daemon rather than systemd, autofs.

     I have tested it and it is now working and in place so RoundCube is again functional.