That bug has been described on https://launchpad.net/distros/ubuntu/+source/sound-juicer/+bug/30308

"[Dapper]

When inserting an audio CD, sound-juicer launches but no information about the CD is downloaded.

On the other hand, if I launch rhythmbox, the CD appears in the left column and the track info is fetched automatically.
...
> Thanks for your bug. Do you have any error on the command line? Does it happen with all your CDs or only one?
...
When I filed the bug, I had tried with 4 or 5, none of them was recognized. I just tried with a few other CDs, and some of them are correctly recognized (this seems related to the CD's popularity ^^). Sound-juicer seems to always try to get info, but sometimes it comes back with nothing.

The weird thing is that rhythmbox always recognizes CDs very well, even the ones sound-juicer doesn't. Shouldn't they be searching from the same database ?

sound-juicer doesn't print anything when launched from the command line : it's perfectly quiet. Should I give some examples of unrecognized CDs ? Should I change the bug title into "sound-juicer should search the same CD database as rhythmbox" ?
...


Have the same behaviour here with ppc and i386. Does not happen in Breezy.
I export MUSICBRAINZ_DEBUG=true and then get the following with sound-juicer 2.13.{4,6}

  url: http://mm.musicbrainz.org:80/cgi-bin/mq_2_1.pl
query: <?xml version="1.0"?>
<rdf:RDF xmlns:rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:dc = "http://purl.org/dc/elements/1.1/"
         xmlns:mq = "http://musicbrainz.org/mm/mq-1.1#"
         xmlns:mm = "http://musicbrainz.org/mm/mm-2.1#">
<mq:GetCDInfo>
   <mq:depth>2</mq:depth>
   <mm:cdindexid>8FsDc5De9N.Fu_VnUcb9l07xc1A-</mm:cdindexid>
</mq:GetCDInfo>
</rdf:RDF>

After the request is made, it is never renewed, even with file->reread cd.
I don't found where the data are cached.
Sound-juicer 2.12.2 (on breezy) make the request with the full toc :

  url: http://mm.musicbrainz.org:80/cgi-bin/mq_2_1.pl
query: <?xml version="1.0"?>
<rdf:RDF xmlns:rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:dc = "http://purl.org/dc/elements/1.1/"
         xmlns:mq = "http://musicbrainz.org/mm/mq-1.1#"
         xmlns:mm = "http://musicbrainz.org/mm/mm-2.1#">
 <mq:GetCDInfo>
  <mq:depth>@DEPTH@</mq:depth>
    <mm:cdindexid>yLpf9vkwv33b55S8W0TVSwTOgfk-</mm:cdindexid>
    <mm:firstTrack>1</mm:firstTrack>
    <mm:lastTrack>18</mm:lastTrack>
    <mm:toc>
      <rdf:Seq>
       <rdf:li>
         <mm:TocInfo>
           <mm:sectorOffset>344792</mm:sectorOffset>
           <mm:numSectors>0</mm:numSectors>
         </mm:TocInfo>
       </rdf:li>
[...]
    </rdf:Seq>
    </mm:toc>
  </mq:GetCDInfo>



Same issue here.

In fact, MusicBrainz doesn't seem to at all be working well... is it really a good idea to use them? What's wrong with the old freedb stuff?"