This tutorial guides through the installation of i-doit, a free, open-source knowledge base and documentation software, on Ubuntu 18.04 | 16.04 using an Apache2 HTTP server. The process involves setting up an Apache2 HTTP server, installing MariaDB to store content, upgrading to PHP 7.2 from third-party repositories, configuring servers via MariaDB, downloading and installing the latest i-doit release, and configuring the Apache2 site configuration file before proceeding with the installation wizard.