https://support.plex.tv/articles/201638786-plex-media-server-url-commands/ wait wrong one

https://support.plex.tv/articles/235974187-enable-repository-updating-for-supported-linux-server-distributions/

All the good terminal commands here:

https://www.linuxbabe.com/ubuntu/install-plex-media-server-ubuntu-18-04

Get System Status

systemctl status plexmediaserver

Restart

sudo systemctl restart plexmediaserver

Extra useful chat:

netsh