Although now there exist even more user-friendly Ubuntu-based distros like Linux Mint and Pinguy OS, Ubuntu was the pioneer and hence has become a brand and de-facto standard, pretty much like Microsoft. Ubuntu was the first to the game of 'user-friendly linux desktop'.
Ubuntu is primarily designed to be used on personal computers, although a server editions does also exist. Ubuntu incorporates all the features of a Unix OS with an added customizable GUI, which makes it popular in universities and research organizations. Ubuntu is an open-source operating system (OS) based on the Debian GNU/Linux distribution. It is a pleasure for us that you have run OnWorks, the free hosting provider to run your workstations online with OS like CentOS, Fedora, Ubuntu and Debian.