Ubuntu is a really popular Operating System, that makes use of the Linux kernel. Even though it's used mainly on desktop machines, its server version has been gaining in popularity recently as well. Ubuntu is one of the lightest Linux releases available and it's compatible with almost any hardware, which makes it a universal Operating System. It is also very stable and secure and has an no less than a 5-year support life cycle, so you are able to get official security and performance updates. Unlike numerous other OS's, Ubuntu is distributed without any license fees and you are able to customize its core, or all of the thousands of packages it features, in any way you find fit. This enables you to set up the perfect software environment for your web applications irrespective of their specifications. As a result of the popularity of the Operating System, Ubuntu has huge developer and user communities, which means that you will always find plenty of materials on the world wide web regarding any question or problem which you may have.