Sam Varghese at ITwire comments the relationship between Ubuntu and Debian by using the different stakeholders statements in this article.
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Friction between Debian and Ubuntu has been developing for some time; last year, the founder of the Debian project, Ian Murdock, was concerned enough to call for timely release cycles by the Debian project. He also urged that an attempt be made to keep the growing family of Debian derivatives united around the common core of the distribution.
At least some Debian developers appear to think that Ubuntu takes more than it gives; this led in part to some wearing T-shirts with the words “F— Ubuntu” at the annual Debian conference in Mexico this year. Some of the common frustrations felt by the Debian crowd were outlined by long-standing Debian developer Martin Krafft in a long posting in his blog soon after the conference. And another Debian veteran Joey Hess has voiced fears that Ubuntu is reducing Debian to “a supermarket of components.”