Ubuntu powered Wall Display using Systemd

Setup a wall display machine that is intended to operate without a user. It opens a Browser and displays a web page full screen and boarderless.

I set this up ages ago and didn't document it as I went so these instructions are incomplete.

loginctl enable-linger <the target user>
sudo systemctl disable sddm
systemctl --user enable [email protected]
systemctl --user enable [email protected]
systemctl --user set-environment XDG_VTNR=1
systemctl --user enable ratpoison
systemctl --user enable firefox-kiosk
systemctl --user enable unclutter