We wrote a quick guide on how to mount your Ipod / iPhone in Ubuntu but that was for Jaunty. Also, it seems that's not working for everyone. So Web Upd8 reader StoneCut wrote a complete (see this huge comment) how-to, for mounting your iPhone on a "virgin" (fresh install) Ubuntu Karmic Koala and I decided to post it here so more people would be able to find it (thank you, StoneCut).
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http://www.webupd8.org/2009/11/complete-guide-to-mounting-your-iphone.html