I really just want to buy a cloud key because I think it'll be easier. -_-
DIY controller stuff
On any sort of OS:
Some easy guides:
Easy-UBNT for supported OSes: https://community.ui.com/questions/Easy-UBNT-Install-Update-and-Secure-UBNT-Software/9ccb57b3-b9a7-4e42-9bae-2306efd8243f
Controller on an RPi, with Pi-hole: https://community.ui.com/questions/Step-By-Step-Tutorial-Guide-Raspberry-Pi-with-UniFi-Controller-and-Pi-hole-from-scratch-headless/e8a24143-bfb8-4a61-973d-0b55320101dc
I should really setup pihole one of these days, and then I can also use it for dnsmasq and local DNS that doesn't die when the internet goes down. Just get DNS off the USG, I already don't use it as it is.