Tutorial: Automated ISPConfig 3 installation on Ubuntu 18.04
This post is from 2018. Versions, commands and links in it may be outdated. The current release is ISPConfig 3.3.2p1.
This tutorial shows how to install ISPConfig 3.1 by using the automated install script from Servisys on an Ubuntu 18.04 LTS server.
https://www.howtoforge.com/tutorial/ispconfig-3-automated-installation-on-ubuntu-1804/