@aliakhter
That procedure is out of date.
“PLEX_MEDIA_SERVER_USER” has not been used since Ubuntu 16 was introduced.
It is only valid for SYS V Linux systems (pid 1 = init)
May I suggest reviewing:
Paying attention to:
As @pl_5309 asks – Confirm the Plex metadata and database (PLEX_MEDIA_APPLICATION_SUPPORT_DIR) is on local storage ?
