I have a LABISTS Raspberry Pi 4 B Model B 4GB with Raspbian 10 installed (Buster). I've been trying to follow UniFi - How to Install and Update via APT on Debian or Ubuntu to install the Ubiquiti UniFi Network Controller to monitor my WiFi network, which uses a Ubiquiti access point. Unfortunately this software requires Oracle Java 8.
I've found various articles from a couple of years ago (e.g. UVC-NVR and JDK 1.8) which rely on
webupd8team, but unfortunately this installation method is no longer available. I found this SO answer - E: Package 'oracle-java8-installer' has no installation candidate - which describes part of the manual installation process.
How do I complete the process?