The specific issues known at this time (spring 2013) are:
<ul>
<li>a bug in PulseAudio that causes it not to give up the
- soundcard when JACK asks</li>
- <li>bad package dependency information that causes a critical
- package to be missing even when JACK and PulseAudio are
- installed</li>
+ soundcard when JACK asks (<a href="https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1163638">LP: #1163638</a></li>
<li>a bug that causes JACK to freeze up when told to stop,
causing issues with restarting</li>
</ul>
<ul>
<li>Cannot start JACK (though see the next section for other
causes of this)</li>
- <li>JACK starts but there is no sound coming from Ardour or other
- applications that use JACK.</li>
</ul>
</p>
</dd>