Automated ISPConfig 3 installation on Debian and Ubuntu
This post is from 2015. Versions, commands and links in it may be outdated. The current release is ISPConfig 3.3.2p1.
The easy way to deploy ISPConfig 3 on your server is the ispconfig_setup script from servisys. The script is an implementation of the perfect server setup instructions. This HowtoForge tutorial will show you how to use it:
https://www.howtoforge.com/tutorial/ispconfig-install-script-debian/