[oosgearoo]

Ok this was going no where so I downloaded a copy of Rasbian stretch and tried to follow the steps here.
Link here

I get as far as step 8 part three "sudo service plexmediaserver restart" 
This fails and running one of the commands it suggested to try to resolve it
systemctl status plexmediaserver.service    brings the following output.

● plexmediaserver.service - Plex Media Server for Linux
   Loaded: loaded (/lib/systemd/system/plexmediaserver.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2018-11-22 21:55:07 GMT; 1min 11s ago
  Process: 2951 ExecStartPre=/bin/sh -c /usr/bin/test -d "${PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR}" || /bin/mkdir -p "${PLEX_MEDIA_SERVER_APPLICATION_SUP

Nov 22 21:55:01 raspberrypi systemd[1]: Failed to start Plex Media Server for Linux.
Nov 22 21:55:01 raspberrypi systemd[1]: plexmediaserver.service: Unit entered failed state.
Nov 22 21:55:01 raspberrypi systemd[1]: plexmediaserver.service: Failed with result 'exit-code'.
Nov 22 21:55:07 raspberrypi systemd[1]: plexmediaserver.service: Service hold-off time over, scheduling restart.
Nov 22 21:55:07 raspberrypi systemd[1]: Stopped Plex Media Server for Linux.
Nov 22 21:55:07 raspberrypi systemd[1]: plexmediaserver.service: Start request repeated too quickly.
Nov 22 21:55:07 raspberrypi systemd[1]: Failed to start Plex Media Server for Linux.
Nov 22 21:55:07 raspberrypi systemd[1]: plexmediaserver.service: Unit entered failed state.
Nov 22 21:55:07 raspberrypi systemd[1]: plexmediaserver.service: Failed with result 'exit-code'.



Perhaps someone here who knows about such things can help with an answer.
This is all on a Pi 3 B.