Can't open mp3 clip for audio

Using Kubuntu 12.10, kdenlive 0.92.
Hi, I tried a search and didn't find an answer that looks close to my question. I'm new to video editing, trying to add an audio soundtrack to a video project. I'd like to use an MP3 file for my audio. When I run the Config wizard, and list available audio codecs, mp3 is not listed.

I've got kubuntu-restricted-extras installed. What do I need to check, are there other packages I need?

Thanks in advance!