This thread finally fixed my issues with plex on Ubuntu after attempting to change permissions for hours.
I linked to the thread to give credit to this awesome person, but below are the commands to use to fix PMS so that it will have access to your media.
Originally Posted by stevenrobertlane 
Most of the methods posted above will work but I have found the easiest way is to change Plex Media Server user to your own user account instead of the plex account.
Type this command to edit the plex script.
sudo nano /etc/default/plexmediaserver
Replace the "plex" user account with your own account.
PLEX_MEDIA_SERVER_USER=plex
Change to
PLEX_MEDIA_SERVER_USER=your user name
control+O to save
Run once
http:// localhost:32400/web/index.html#!/dashboard
Stop:
sudo service plexmediaserver stop
add user to group:
sudo addgroup plex youruser
sudo addgroup youruser plex
start:
sudo service plexmediaserver start
I have messed around with all the other methods and they have worked e.g. mounting partition in different folders and changing permissions but find this method above far easier.
And NTFS is fine.
Hope this helps
Type this command to edit the plex script.
sudo nano /etc/default/plexmediaserver
Replace the "plex" user account with your own account.
PLEX_MEDIA_SERVER_USER=plex
Change to
PLEX_MEDIA_SERVER_USER=your user name
control+O to save
Run once
http:// localhost:32400/web/index.html#!/dashboard
Stop:
sudo service plexmediaserver stop
add user to group:
sudo addgroup plex youruser
sudo addgroup youruser plex
start:
sudo service plexmediaserver start
I have messed around with all the other methods and they have worked e.g. mounting partition in different folders and changing permissions but find this method above far easier.
And NTFS is fine.
Hope this helps
