Comment # 9 on bug 1089989 from Dr. Werner Fink

t450:~ # systemctl  status user@457.service
��� user@457.service - User Manager for UID 457
   Loaded: loaded (/etc/systemd/system/user@.service; static; vendor preset:
disabled)
   Active: failed (Result: protocol) since Wed 2018-04-18 10:33:40 CEST; 32s
ago
  Process: 19887 ExecStart=/usr/lib/systemd/systemd --user (code=exited,
status=1/FAILURE)
 Main PID: 19887 (code=exited, status=1/FAILURE)

Apr 18 10:33:46 t450.site systemd[1]: user@457.service: Failed with result
'protocol'.
Apr 18 10:33:47 t450.site systemd[1]: user@457.service: Start request repeated
too quickly.
Apr 18 10:33:47 t450.site systemd[1]: Failed to start User Manager for UID 457.
Apr 18 10:33:47 t450.site systemd[1]: user@457.service: Failed with result
'protocol'.
Apr 18 10:33:47 t450.site systemd[1]: user@457.service: Start request repeated
too quickly.
Apr 18 10:33:47 t450.site systemd[1]: Failed to start User Manager for UID 457.
Apr 18 10:33:47 t450.site systemd[1]: user@457.service: Failed with result
'protocol'.
Apr 18 10:33:47 t450.site systemd[1]: user@457.service: Start request repeated
too quickly.
Apr 18 10:33:47 t450.site systemd[1]: Failed to start User Manager for UID 457.
Apr 18 10:33:47 t450.site systemd[1]: user@457.service: Failed with result
'protocol'.