This is a quick tutorial on how to install Ubuntu OS on your Dell desktop machine. As we know, Ubuntu is a Debian-based Linux operating system, with Unity as its default desktop environment. It is based on free software and named after the Southern African philosophy of ubuntu. 1. First check if your Dell model has been tested and supported by by Canonical 2. Insert the Ubuntu disk into your DVD drive or connect your Bootable USB into a port on the system.