*Right click on desktop and create a text file
*Paste this into it:
[plexmediaserver]
title=Plex Media Server (Standard)
description=The Plex Media Server
ports=32400/tcp|3005/tcp|5353/udp|8324/tcp|32410:32414/udp
[plexmediaserver-dlna]
title=Plex Media Server (DLNA)
description=The Plex Media Server (additional DLNA capability only)
ports=1900/udp|32469/tcp
[plexmediaserver-all]
title=Plex Media Server (Standard + DLNA)
description=The Plex Media Server (with additional DLNA capability)
ports=32400/tcp|3005/tcp|5353/udp|8324/tcp|32410:32414/udp|1900/udp|32469/tcp
*Save file as plexmediaserver (no txt)
*In Terminal, run: sudo -i nautilus
*Browse to Computer/etc/ufw/applications.d
*Drag and drop plexmediaserver
*Run: sudo ufw app update plexmediaserver
*Run: sudo ufw allow plexmediaserver-all