Ubuntu is a very popular OS, that uses the Linux kernel. While it is used primarily on desktop machines, its server version has been gaining in popularity recently as well. Ubuntu is one of the lightest Linux releases out there and it's compatible with almost any kind of hardware, that makes it a universal OS. It's also very stable and secure and has an no less than a five-year support life cycle, so you will be able to get official protection and performance updates. Unlike a number of other OS's, Ubuntu is distributed without any license fees and you are able to customize its core, and all of the thousands of packages it contains, in any way you see fit. This will allow you to install the proper software environment for all of your web applications whatever their specifications. Due to the popularity of the Operating System, Ubuntu has large developer and user communities, which means that you will always find a lot of materials online regarding any question or problem that you might have.