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What exactly does this repository contain and why should a user either stay away from it, or add the repository?

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3 Answers 3

up vote 13 down vote accepted

N.N. is correct, but let me give you an example:

When a version of Ubuntu is released and is considered stable the stable release updates just don't get uploaded into the archive. So let's say a piece of software needs an update, after they go through the stable release update process they get uploaded to the "proposed" pocket. (Step 4 in the linked document):

Upload the fixed package to release-proposed with the patch in the bug report, a detailed and user-readable changelog, and no other unrelated changes.

Here's a list of what some of the updates look like. Then the people who have enabled the proposed section (including the person that uploaded it) test it, this usually takes about a week, sometimes less.

After that the update is pushed via the normal update channel and you get it via the update manager. Basically it's just a place to test updates before they hit the general public.

More info:

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@oxwivi Correct. –  Jorge Castro Jun 20 '11 at 13:42
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It's not always stable releases. Sometimes pre-release versions will be tested in -proposed –  Oli Jun 21 '11 at 13:37
    
When I downvoted this answer :o –  Tachyons Apr 30 '12 at 7:58
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Essentially it's a testing ground for packages (and more commonly package versions) before they're released into the main repositories. So the normal update rules apply: unless strictly necessary, you'll only get serious bug fixes and security patches through this.

If you enable it you get things before they're fully tested. From my experience it's not as unstable as an alpha or beta version of Ubuntu but it could be. As such you should probably only be using it if you exist to give feedback on packages. You probably shouldn't use it on production machines.

tl;dr, Don't use it unless you have to.

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According to the community documentation on repositories the proposed repository is:

The testing area for updates. This repository is recommended only to those interested in helping to test updates and provide feedback.

According to the community documentation on backports the proposed repository is:

the testing area for -updates. A number of people must give positive feedback on these packages before they are allowed into -updates. This repository is recommended ONLY to people interested in helping to test updates and provide feedback. Since they are in effect testing updates, there is a higher chance of defective updates in this repository.

Also see this thread and its links.

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Prerelease packages (as in beta/RC)? –  Oxwivi Jun 20 '11 at 13:31
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