The H looks at the history of the popular Linux distro and the details of its relationship with Debian More here

Ubuntu is Debian unstable with some of the rough edges smoothed over, some security features deprecated and some enhanced, the implementation of proprietary blobs made easier, a bit of polish, a different theme, and a lot less packages. Ubuntu is a clean and polished experience for those new to GNU/Linux, (although the ‘release often release early’ philosophy it has taken from other free software projects has created occasional stability issues). The success of Ubuntu is a testimony both to the marketing and packaging of Canonical, Ubuntu’s holding company, and to the ongoing application and innovation of the Debian community whose work lies at the core of every release of Ubuntu.