idroot published a tutorial about installing LibreNMS on Ubuntu 20.04 LTS.
How To Install LibreNMS on Ubuntu 20.04 LTS
In this tutorial we will show you how to install LibreNMS on Ubuntu 20.04 LTS with LEMP, as well as some extra required package by LibreNMS
How To Install LibreNMS on Ubuntu 20.04 LTS - idroot