12.10: GNOME Sound Converter and MP3
GNOME Sound Converter need a plugin to convert MP3. But there is no link for Ubuntu 12.10 in the URL that is given in the properties dialog: http://soundconverter.org/gstreamer-mp3-encoding-howto/ This worked for me, running as root: apt-get install gstreamer0.10-plugins-ugly
This is a personal note. Last updated: 2013-04-19 12:17:20.