Ubuntu is an extremely popular Operating System, which uses the Linux kernel. Even though it's used primarily on desktop machines, its server version has been gaining in popularity recently as well. Ubuntu is one of the lightest Linux distributions available and it supports almost any hardware, that makes it a universal OS. It is also very stable and secure and has an a minimum of a five-year support life cycle, so you'll be able to receive official security and performance updates. Unlike many other OS's, Ubuntu is distributed with no license fees and you're able to customize its core, as well as any of the numerous packages it features, in any way you see fit. This enables you to set up the perfect software environment for all your web applications irrespective of their requirements. Because of the popularity of the OS, Ubuntu has huge developer and user communities, so you will always find lots of materials online about any question or problem which you may have.