This bug was fixed in the package ltsp - 5.1.25-0ubuntu1
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ltsp (5.1.25-0ubuntu1) intrepid; urgency=low
* new upstream version (5.1.25)
* Allow users to shutdown the thin client (LP: #274803)
* Set PULSE_SERVER to 127.0.0.1 for localapps (LP: #274902)
* Fix
** Attachment added: /usr/bin/xrexecd.sh
http://launchpadlibrarian.net/17986955/xrexecd.patch
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PULSE_SERVER not set for localapps
https://bugs.launchpad.net/bugs/274902
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