I Found the problem 
External Drive was mounted with fstab as user which automatically implies noexec and since the Plex Scanner loads a shared library, exec is needed as an fstab option:
... /media/plex ext4 defaults,user,exec,nofail 0 2
I Found the problem
External Drive was mounted with fstab as user which automatically implies noexec and since the Plex Scanner loads a shared library, exec is needed as an fstab option:
... /media/plex ext4 defaults,user,exec,nofail 0 2
