Comment 13 for bug 1956787

That's a sensible approach, but there are loads of web pages telling people how to set up NFS, and they all claim that on current distributions you no longer need to enable individual services. That's not true for Ubuntu 20.

Please do make sure it's fix in 22.04.

The original reasoning had a hole in it: with the scripts, there were three states: on, off, and default. Default was on. With the patch the default is off. I see no way in systemd to duplicate the way the scripts worked purely within systemd.

This problem is particularly insidious. First, the symptoms aren't obvious. It took us a couple of days to figure out what was going on. Second, the problem doesn't occur if you mount anything by NFS3. So things worked in testing, but failed the first time we rebooting in production.