Flarum is a lightweight and modern open-source forum software built with PHP and MySQL. It supports extensions, has a clean UI, and is easy to set up. This guide will walk you through installing Flarum from scratch on an Ubuntu server, configuring Nginx, PHP, and MariaDB, and setting up HTTPS for secure access. 1. System Requirements Before installing Flarum, ensure your server meets the following requirements: Operating System: Ubuntu 20.04 / 22.04 Web Server: Nginx (recommended) PHP Version: