I try to activate MP3 profile on "Output Format" (on Sound Juicer) or "Preferred Format" (on Rhythmbox) without success.

I'm using Ubuntu 8.04, upgrade from 7

The only thing I need to do was:

apt-get install gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse

I get help from:
http://ubuntuforums.org/showthread.php?t=957&page=5

"Originally Posted by Jacob Bezemer

Ubuntu: Ripping in mp3 with id3 tags
By default, ubuntu does not come with this enabled. To add functionality to rip mp3's in ubuntu with sound juicer with id3 tags, lets do the following.

1. Install the necessary gstreamer packages:
# apt-get install gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse
2. Load sound juicer, go to Edit->Preferences
3. Under Format, choose Edit Profiles, and click New.
4. For Profile name, pick mp3 and hit Create.
5. Then click on the mp3 profile and click Edit.
6. Change the gstreamer pipeline to the following:
audio/x-raw-int,rate=44100,channels=2 ! lame name=enc ! id3mux
7. Then set the File Extension to "mp3".
8. Click on the checkmark box "Active?" then click Ok.
9. Hit Close on the Edit profiles screen.
10. You will need to exit the sound juicer application and restart it.
11. After reloading sound juicer, go back to Edit->Preferences and under the Output format section, you will now be able to set the newly created mp3 profile you created.

This will create mp3 files with a bitrate of 128 kb/s. Now stick in your cd's and you should be ready to go! If you are using another cd extracting program which uses gstreamer, this functionality should work fine as you just added a new gstreamer profile to the system, not specifically to sound juicer.
Tested under dapper."

Thxs Ubuntu Forum and Community!!