[Bug 93551] Re: Missing Shutdown and Reboot buttons from gnome "power" button

[matt felser]

Assuming you are using XGL, this is a known error.  However, there is a
workaround.

Your startxgl.sh file should be as follows:

#!/bin/sh
Xgl -fullscreen :1 -ac -br -accel glx:pbuffer -accel xv:pbuffer &
sleep 4  
export DISPLAY=:1 
cookie="$(xauth -i nextract - :0 | cut -d ' ' -f 9)"
xauth -i add :1 . "$cookie"
exec gnome-session

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Missing Shutdown and Reboot buttons from gnome "power" button
https://launchpad.net/bugs/93551