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|This article aims at solving some common mistunderstandings about Ubuntu found amongst Debian developers and users.
== Why should I care about Ubuntu ? ==
* Ubuntu is [http://www.ubuntulinux.org/ubuntu/relationship Debian-based and advertises this fact].
* Ubuntu wants to contribute back to Debian (even if it's not done perfectly currently - see below)
* Ubuntu has a large userbase, is a quality GNU/Linux distribution, enabling new users to come tu GNU/Linux.
* Ubuntu has a big community of developers and advocates. Debian can benefit from it.
* Ubuntu brought much to the Free Software world, in areas where Debian hasn't totally succeeded yet (like desktop system for end users, or hardware support)
* A lot of Debian developers and users also use Ubuntu, often on their laptops.
== What is Universe ? And MOTU ? ==
Debian has 3 sections : ''main'', ''contrib'', and ''non-free''. Ubuntu, on the other hand, has four of them : ''main'', ''restricted'', ''universe'' and ''multiverse''. While ''main'' packages (and their non-free counterparts ''restricted'' packages) are maintained and fully supported by the Ubuntu team, ''Universe'' is a section of the Ubuntu archive which isn't officially supported. ''Universe'' aims at providing as many packages as possible, from difference sources (Debian, of course, but also [http://www.apt-get.org/ apt-get.org] or [http://revu.tauware.de/ REVU]).
The MOTUs (Master of the Universe) are a bunch of volunteers taking care of Universe : they sync (import without modification) and merge (import and modify) packages in Ubuntu, deal with bugs, etc.
Read [http://ubuntulinux.org/ubuntu/components ubuntu/components] for more info about Ubuntu's components, and ["MOTU"] for more info about MOTUs.
== What kind of divergence is introduced inside Ubuntu ? Why does Ubuntu need to change my packages ? Are those changes important ? ==
Ubuntu sometimes needs to modify Universe packages so that they will build and work on an Ubuntu system. This is usually due to a library transition that Ubuntu has undergone first, change of the default Python version (Ubuntu uses Python 2.4 by default), dependancies changed because of a different X.org packaging, etc. In other cases, it is because an Ubuntu user has found a bug (in either the program or the packaging) before someone filed one in the Debian BTS. 99% of the changes to packages in Universe are small and unobtrusive, but there are of course exceptions.
Packages in the ''main'' section of Ubuntu, are often more heavily modified to suit Ubuntu's needs. Backporting Ubuntu changes to Debian is therefore a difficult process for them.
== Ubuntu's way of ''contributing to Debian'' really sucks. ==
Yeah, we know that. Apart from [http://people.ubuntu.com/~scott/patches/ publishing patches on an ongoing basis] (patches which might not be very usable from the DD point of view), Ubuntu doesn't provide much valuable feedback to Debian currently. There are several reasons for this :
* '''Lack of manpower''' : There are 8400 packages in universe, and only [https://launchpad.net/people/motu about 35 MOTUs] (some of them inactive).
* '''Lack of tools''' : We currently lack most of the tools to take care of the packages in a global way. For example, it is humanly very difficult for 35 volunteers to manually file bugs in the Debian BTS.
There are some plans to change that by improving processes and writing tools, but this takes time.
== Short crash course in Ubuntu development ==
* Most of the documentation about Ubuntu and Ubuntu development can be found on [https://wiki.ubuntu.com/FrontPage wiki.u.c]
* Ubuntu's Bug Tracking System is [https://launchpad.net/distros/ubuntu/+bugs-advanced Malone]