Here: https://www.ispconfig.org/documentation/ you can find: ISPConfig 3.1: Automated installation on Debian and Ubuntu ISPConfig Kickstarter These are outdated links. But there are no news about: https://github.com/servisys/ispconfig_setup https://git.ispconfig.org/ispconfig/ispconfig-autoinstaller
There will be a new automated installation tutorial for single servers soon and we'll adjust the autoinstall section when it's available.