Ubuntu is a really popular OS, which employs the Linux kernel. Although it is used mainly on personal computers, its server version has been gaining in popularity these days as well. Ubuntu is among the lightest Linux distributions you can get and it's compatible with almost any kind of hardware, which makes it a universal OS. It is also very stable and secure and has an at least a five-year support life cycle, so you can get official security and performance updates. Unlike alternative OS's, Ubuntu is distributed with no license fees and you are able to customize its core, and / or any of the countless packages it contains, in any way you see fit. This enables you to install the optimal software environment for all of your web apps irrespective of their specifications. Due to the popularity of the Operating System, Ubuntu has large developer and user communities, which means that you can always find find lots of materials on the world wide web related to any question or problem which you may have.