The relevant source code line is:
QProcess::startDetached( "gdm-signal -h" ); // Gnome shutdown
The first problem with that is that gdm-signal in the
"powermanagement-interface" package, which isn't preinstalled in a standard
Ubuntu installation.
The second problem is that even if one installs that package, gdm-signal -h
seems to no longer work.
A simple workaround is to not install the powermanagement-interface package,
but to create a /usr/bin/gdm-signal script instead with the following contents:
#!/bin/sh
gnome-power-cmd shutdown
(don't forget to chmod +x the script)
Unfortunately, gnome-power-cmd is no longer there in Karmic.
Someone should ask the gnome people for a stable way to poweroff without having
sudo priviledges and without modifying the sudoers file. :)
** Changed in: italc (Ubuntu)
Status: New => Confirmed
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"power down" request fails on 9.04; logout instead
https://bugs.launchpad.net/bugs/367960
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