Plex media server will autoboot ๐ Fix Plex Permission Issues Update and install the plex media server sudo apt-get update & sudo apt-get install plexmediaserver -y Update your repositories and install the keyring sudo apt-get update & sudo apt-get install deb-multimedia-keyring -y public main' | sudo tee -a /etc/apt//plex.list key file from here and replace it in the wget line wget -O - | sudo apt-key add -ฤฎcho 'deb. If you get the key is not found error then it may have changed name, find the. Grab the Plex gpg key and add Plex repositories, there are three separate linesย in the block below.