Ubuntu is a very popular OS, which uses the Linux kernel. Although it is used primarily on personal computers, its server version has been becoming more popular these days as well. Ubuntu is one of the lightest Linux releases available and it is compatible with almost any hardware, that makes it a universal OS. It's also very stable and secure and has an a minimum of a 5-year support life cycle, so you can receive official security and performance updates. Unlike a number of 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 allows you to install the best software environment for all your web applications whatever their specifications. As a result of the popularity of the OS, Ubuntu has huge developer and user communities, so you'll always find find plenty of materials on the web about any question or problem which you may have.