Ubuntu (Canonical)

  Ubuntu is a free computer operating system based on the Linux kernel. Its name comes from the Zulu word ubuntu, loosely translated as "humanity" or "A person is a Person Only Through Other Persons". Ubuntu's goals include providing an up-to-date, stable operating system for the average user, with a strong focus on usability and ease of installation. Ubuntu has been rated as the most popular Linux distribution,claiming approximately 30% of desktop Linux installations in a survey.

http://www.ubuntu.com/