On 06/13/2012 03:31 AM, Jan Middelkoop wrote:

> And that concludes this drive-by introduction to pulseaudio in LTSP. As
> for the specific problem you're having - the question you should be
> asking yourself is: what have you changed since the last time you ran
> ltsp-update-image? My experience is that usually these things do not
> happen 'spontaneously', despite obvious appearances.

Hooray! This turned out to be the key. My problem is solved. Here, for 
the record, is a short summary.

I wanted to use ltsp-localapps on the thin client to do some things that 
require the sudo command. So I used copies of these files from the 
server to overwrite the ones in /opt/ltsp/i386/etc:
   /etc/passwd
   /etc/shadow
   /etc/sudoers
   /etc/sudoers.d/README
Then "ltsp-update-image --arch i386" gave me a chroot in which sudo 
would work.

What went wrong? My list of new files for the chroot missed one:
   /etc/group
It was the log file on the client (/var/log/syslog) that alerted me to a 
discrepancy between the GID for user "pulse" declared in /etc/passwd 
(which I had replaced) and /etc/group (which I had forgotten). 
Refreshing /etc/group and updating the image has me enjoying audio again.

[Aside: In an earlier response, I incorrectly echoed one of Jan's 
statements. The pulseaudio server should run on the thin client, so it 
can drive the speakers, but it should *not* run on the LTSP server. I 
apologize for letting this misconception leak into the archive.]

Warm thanks to David, Richard, and especially Jan for their generous and 
helpful guidance!

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