lxsession-logout does not work when systemd is installed. The code does not support shutdown or reboot for systemd.
Also, the dialog box that appears on issuing the logout/shutdown request may not have all of the buttons (Shutdown, Reboot, Hibernate, Suspend, etc.) I think this dialog display is controlled by policykit settings, but it is difficult for the user to know how to change the settings if they are not correct.
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