I think the problem is best described here:
https://bugs.launchpad.net/ubuntu/+source/amarok/+bug/346246/comments/9
It's not exactly trivial to do.
** Changed in: amarok (Ubuntu)
Status: Confirmed => Triaged
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Amarok in Ubuntu 9.04 does not offer to install restricted codecs (like MP3)
https://bugs.launchpad.net/bugs/346246
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