I get this error after install Plex
systemd[1]: Failed to start Verify integrity of password and group files.
systemctl status shadow.service
● shadow.service - Verify integrity of password and group files
Loaded: loaded (/usr/lib/systemd/system/shadow.service; static; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2018-11-02 14:28:09 CET; 4min 40s ago
Process: 1497 ExecStart=/usr/sbin/pwck -r (code=exited, status=2)
Main PID: 1497 (code=exited, status=2)
nov 02 14:28:09 massi-pc systemd[1]: Starting Verify integrity of password and group files...
nov 02 14:28:09 massi-pc pwck[1497]: user 'plex': program '/usr/bin/nologin' does not exist
nov 02 14:28:09 massi-pc pwck[1497]: pwck: nessuna modifica
nov 02 14:28:09 massi-pc systemd[1]: shadow.service: Main process exited, code=exited, status=2/INVALI>
nov 02 14:28:09 massi-pc systemd[1]: shadow.service: Failed with result 'exit-code'.
nov 02 14:28:09 massi-pc systemd[1]: Failed to start Verify integrity of password and group files.
I can only confirm that usr/bin/nologin does not exist, but what can I do ??