xfce4-session - Known Problems
Shutting down your computer using the session manager
Since 4.1.5, the session manager supports only sudo(8)-based shutdown, other
method can be added by packagers if desired, just replace XfsmShutdownHelper
with your code. To be able to shutdown the computer, you must be listed
in the systems sudoers file, in particular, you must be allowed to execute
$HELPER_PATH_PREFIX/xfce4/session/xfsm-shutdown-helper as user root (where
$HELPER_PATH_PREFIX is the directory …
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