Plex media server Install script problem

Hi guys,
i’m my new quickbox seedbox, i have installed from the web home page plex.
the installation completed successull , but then the service don’t start

with the command :

sudo service plexmediasever start
i recive :
Failed to start plexmediasever.service: Unit plexmediasever.service not found.

with the command :
systemctl status plexmediaserver.service

i recive the output :

● plexmediaserver.service - Plex Media Server for Linuxer.service
Loaded: loaded (/etc/systemd/system/plexmediaserver.service; enabled; vendor preset: enabled)
Active: inactive (dead) (Result: exit-code) since Sun 2017-03-26 19:20:09 CEST; 5min ago
Process: 38336 ExecStartPre=/bin/sh -c /usr/bin/test -d “${PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR}” || /bin/mkdir -p "${PLEX_MEDIA_SERVER

Anyone can help me plex ?
Best regards.

manually created plex user and group
then created plexmediaserver directory and :

sudo chmod 0777 -R /var/lib/plexmediaserver
sudo chown plex:plex -R /var/lib/plexmediaserver
sudo service plexmediaserver restart

now it’s all ok
Best Regards.

I have experienced this as well on my last few installs. Have any of the higher ups noticed this yet?