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 --prompt-rootp
** Attachment added: "/etc/sudoers"
http://launchpadlibrarian.net/17978631/sudo.patch
** Changed in: ltsp (Ubuntu)
Importance: Undecided => Wishlist
Status: New => Triaged
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Allow shutdown to be started as root on thin clients (localapps)
https://bugs.launchpad.net/bugs/274803
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