Ubuntu is a really popular OS, that makes use of the Linux kernel. Even though it's used mainly on PCs, its server version has been gaining in popularity these days as well. Ubuntu is among the lightest Linux releases you can get and it is compatible with almost any hardware, that makes it a universal Operating System. It's also very stable and secure and has an no less than a five-year support life cycle, so you'll be able to receive official security and performance updates. Unlike lots of other OS's, Ubuntu is distributed with no license fees and you'll be able to modify its core, and / or any of the countless packages it comes with, in any way you find fit. This will allow you to set up the proper software environment for all of your web applications regardless of their specifications. Due to the popularity of the Operating System, Ubuntu has huge developer and user communities, which means that you will always find numerous materials on the Internet regarding any question or problem that you may have.