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There are many other distributions that also share the same basic infrastructure (package and archive format). Ubuntu is distinguished from them in a number of ways.
First, Ubuntu contributes patches directly to Debian as bugs are fixed during the Ubuntu release pro- cess, not just when the release is actually made. With other Debian-style distributions, the source code and patches are made available in a "big bang" at release time, which makes them difficult to integrate into the upstream HEAD.
Second, Ubuntu includes a number of full-time contributors who are also Debian developers. Many of the other distributions that use Debian-style packaging do not include any active Debian contributors.
Third, Ubuntu makes much more frequent and fresher releases. Our release policy of releasing every six months is (at the time of writing :-) unique in the Linux distribution world. Ubuntu aims to provide you with a regular stable and security-supported snapshot of the best of the open source world.