I have said it often and I will say this again. This guide is garbage. Please start from scratch with our official setup instructions. As Linux “noob” you might want to use a graphical environment to setup Plex and the typical UI tools to mount your drives. If you do, please skip the “Mounting USB Drives” part and directly move on to " User Mode Plex Media Server". Thus, PMS will have access to all your USB drives and network shares and you do not have the learn all the Linux internals right now. However, if you want to use Plex an your RPi without a GUI, you have to use the traditional instructions, i.e. “Mounting USB Drives” .
FYI: I will remove your link to not improve SEO for these people.
