Trouble with user account on separate drive in Mojave
I have this issue on a 2012 Mac Mini and a 2009 (firmware updated to 5,1) Mac Pro.
Both run Mojave 10.14.6
My user account located on a separate drive, after a restart, does not load (both machines have separate drives for my user account).
Instead, a user by the same name is created on my boot drive -- absent any files associated with that account -- and, logging in, I am presented with an infinite loop of "repair user library" requests, each requiring my login password.
If I log in as root or another administrative account, arrange to see invisibles, then elect the Volumes folder, I see an empty folder with the name of my user account drive. I also see my user account drive with the number "1" appended to it.
If I delete the empty folder mentioned above in Volumes and repair my user account drive, that drive loses the appended "1". I then reselect it in the Advanced option for my account in the User Accounts tab of System Prefs.
That done, I can log out and then log in to my account and find it functioning again.
Here is the problem -- if I restart, I must begin the same process all over. Every time.
I've posted before about this, but if gets lost pretty quickly in the sheer volume of posts.
I've searched for others with this issue, to no avail.
I've run etrecheck, started in recovery mode and repaired every drive (all tested fine), and started in safe mode. I've probably forgotten other things I've done in the time this has been a problem.
Nothing has worked, aside from the process described earlier. I'm hoping there's someone out there who can point me in a promising direction.