Ubuntu is an extremely popular OS, which employs the Linux kernel. Even though it is used mainly on personal computers, its server version has been rising in popularity these days as well. Ubuntu is among the lightest Linux distributions out there and it's compatible with almost any 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 will be able to receive official security and performance updates. Unlike alternative OS's, Ubuntu is distributed with no license fees and you will be able to customize its core, as well as all of the thousands of packages it comes with, in any way you see fit. This allows you to set up the best software environment for all your web applications regardless of their requirements. Because of the popularity of the Operating System, Ubuntu has huge developer and user communities, which means that you can always find find lots of materials on the web related to any question or problem that you might have.