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What does each of the packages do? I was installing libmozjs-dev, and it said that the following packages need to be removed:

couchdb-bin desktopcouch evolution-couchdb gnome-user-guide python-desktopcouch python-desktopcouch-records ubuntu-desktop ubuntu-docs xulrunner-1.9.1 yelp

I see some are self-explanatory, what do the ones with couchdb mean? and if I remove the packages, what effect will it have on my system?

Thanks.

EDIT: I am on Karmic.

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3 Answers

up vote 6 down vote accepted

I wouldn't say they're explicitly Ubuntu One related.

CouchDB is a database. It's a fairly light, fairly fast way of storing simple data. Applications can use it to store their data. One advantage over things like SQLite (that is faster than CouchDB) is it is much easier to dump a load of records to JSON and import them at another end without conflict. You can do this with relational databases but it usually means layering on some transaction-logging logic which can still cause problems in asynchronous settings. This means it can easily be used in version control systems like Ubuntu One a lot more efficiently.

I think we're getting away from the real point somewhat. The clue that something isn't right should be the presence of ubuntu-desktop in that lot. It's just a metapackage but it holds the dependencies for most of the Ubuntu desktop system. If you remove it, and then something does an auto-remove, you'll probably lose most of your desktop.

There's also a conflict with xulrunner-1.9.1 which is a core dependency of Firefox.

In short, libmozjs-dev isn't compatible with whatever you're trying to install it on. I note that libmozjs-dev has been dropped from the past two releases so if you're trying to force it into Lucid or Maverick (10.04/10.10) I would stop now and look for another way of installing it (namely downloading it from Mozilla and compiling it yourself).

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yeah, im trying to install libmozjs, to install mongoDB. So i tried making a symbolic link, but still, i see problems. –  theTuxRacer Oct 27 '10 at 10:04
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What's wrong with sudo apt-get install mongodb? –  Oli Oct 27 '10 at 10:20
    
The .couch files in my system are as binary blobs as the sqlites ones. The main difference is that Desktop is not a relational database but a document oriented one (whatever that means). Replication is easier because it don't use a primary key per table, but a unique uuuid per record. I've been evaluating using it in a project, I run back to sqllite (the project must run on windows too), but it looked interesting. –  Javier Rivera Oct 27 '10 at 10:28
    
Mine was just a simple and quick explanation 'cos I've supposed that he was wondering why that packages were on is pc. Obviously your answer is far away better. –  skalka Oct 27 '10 at 12:16
    
@Oli I tried that many times, and it needs libmozjs. If I fetch libmozjsdev, then all the above packages are removed. So I made a sym link from firefox's folder, but the mongo shell crashes on basic commands, im guessing because libmozjs is improperly installed. I now built mongo and spidermonkey, its working, but its not convienient. have to go into the folder, and run the shell scripts for the daemon and client separately :((( PS: USing karmic, and updated the OP. –  theTuxRacer Oct 28 '10 at 1:56
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All the packages that have couch* in their names are related to Ubuntu One. ubuntu-desktop is a meta-package which install all the standard packages in Ubuntu, you'll find for example also kubuntu-desktop, xubuntu-desktop. gnome-user-guide is self explanatory, xulrunner is related to Firefox, ubuntu-docs is the Ubuntu specific documentation, yelp is gnome help on line browser.

You can find more detailed description in Ubuntu Software Center or in Synaptic.

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Contrary to what others say, xulrunner is not a dependency of Firefox anymore in recent versions. It is a dependency of yelp (the GNOME help browser) though, and that's probably the reason why several documentation packages get removed too.

CouchDB depends on xulrunner too, probably for the JavaScript engine. CouchDB is used by (parts of) UbuntuOne in the form of DesktopCouch (but other applications can use it too of course).

Also, the last version of Ubuntu that included libmozjs was “Karmic”, and I'm pretty sure the functionality it includes is also available in xulrunner, so maybe you can use that instead of libmozjs?

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I would have trie that, but honestly I spent an entire working day to get mongodb up, and im not willing to sacrifice another. but ill remember it, and try it on a sunday or something. Also, i am using Karmic :P –  theTuxRacer Oct 28 '10 at 1:57
    
In Maverick (and Lucid too, I suppose) MongoDB depends on xulrunner. It might be possible to backport one of those versions to Karmic. –  JanC Oct 28 '10 at 3:29
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