Ubuntu is a really popular Operating System, that uses the Linux kernel. Although it is used primarily on desktops, its server version has been gaining in popularity recently as well. Ubuntu is one of the lightest Linux distributions available and it's compatible with almost any kind of hardware, that makes it a universal Operating System. It's also very stable and secure and has an at the very least a 5-year support life cycle, so you can receive official safety and performance updates. Unlike many other Operating Systems, Ubuntu is distributed without any license fees and you can modify its core, as well as all of the numerous packages it features, in any way you see fit. This allows you to set up the optimal software environment for your web apps whatever their specifications. Because of the popularity of the Operating System, Ubuntu has large developer and user communities, so you will always find a lot of materials on the web related to any question or problem that you may have.