Ubuntu is a very popular OS, which makes use of the Linux kernel. Although it's used primarily on PCs, its server version has been gaining in popularity nowadays as well. Ubuntu is one of the lightest Linux distributions available and it is compatible with almost any kind of hardware, which makes it a universal OS. It's also very stable and secure and has an no less than a 5-year support life cycle, so you can receive official protection and performance updates. Unlike a number of other OS's, Ubuntu is distributed without any license fees and you can modify its core, and all of the numerous packages it contains, in any way you see fit. This will allow you to install the best software environment for all your web applications regardless of their requirements. Because of the popularity of the OS, Ubuntu has huge developer and user communities, so that you'll always find find numerous materials on the Internet regarding any question or problem that you may have.