Failed to start — Read/write access Plex Media Server dir

[ChuckPa]

You have something running on your machine which is breaking Plex.

I can show you how to move the directory but the question is: Will it happen again?

Moving PMS 'Library'

Moving Plex’s metadata (Library) directory on systemd based systems This information is intended for those systems where cat /proc/1/comm returns systemd. If your system returns init, please see the next post in this thread. While you may change /lib/systemd/system/plexmediaserver.service, it is under the control of the package manager and subject to replacement without warning at any time during an update. To provide stability, systemd allows creation of an override.conf file to customiz…

You want post #2 (systemd)