systemd has been working great here, system-wide as well as in all user instances except one. I'm not exactly sure what all the steps are in the process to get a systemd user instance running. The directory /run/user/$UID was not being created, though.
I made some progress by running `systemctl start user@<username>.service` and the /run/user/$UID was created. `systemctl --user status` returns `Failed to connect to bus: No such file or directory`. XDG_RUNTIME_DIR is not being set, but a command like `XDG_RUNTIME_DIR=/run/user/$UID systemctl --user status` runs successfully, so I think it's down to this last piece. Apparently XDG_RUNTIME_DIR is related to PAM? I don't think I should have to change PAM settings or anything like that since systemd is working fine already in the other user accounts. I couldn't find any info on how to fix this part... What do you experts think? The computer is stuck with CentOS 8 unfortunately and old v239 of systemd, but I don't think that's the issue either since systemd is working fine in all other cases. I just wanted you to know in case there are some deprecated commands or config needed to fix the problem. Thanks
