Hi,
I'm having exactly the same issue only noticed when my system drive started filling up. Tried everything in this thread to no avail e.g. uninstall and clear all files and user permissions etc and reinstall. My current system has been upgraded from OMV 2.x to OMV 3.x currently on 3.0.86 so just wondering is there is a hangover from the upgrade. Plex is working fine just can't seem to get it to use the Database Folder that is specified in the Web Gui therefore still writing to the /var/lib directory. Tried specifying the directory when creating my libraries through the Plex Web Guide but that doesn't work either.
I don't have /etc/systemd/plexmediaserver.service.d or /etc/systemd/system/plexmediaserver.service.d directories.
Running Plex Media Server plugin 3.8.1
Any help would be gladly received.
Thanks
Dag