Checking /usr/share/polkit-1/actions/org.freedesktop.login1.policy it's easy to see that poweroff has different a different policy than reboot.
<action id="org.freedesktop.login1.power-off-multiple-sessions"> <allow_active>yes</allow_active>
<action id="org.freedesktop.login1.reboot-multiple-sessions"> <allow_active>auth_admin_keep</allow_active>
So the question is, how should lightdm-gtk-greeter react to the "challenge" value it receives now (instead of "yes")?
Checking /usr/share/ polkit- 1/actions/ org.freedesktop .login1. policy it's easy to see that poweroff has different a different policy than reboot.
<action id="org. freedesktop. login1. power-off- multiple- sessions" > active> yes</allow_ active>
<allow_
<action id="org. freedesktop. login1. reboot- multiple- sessions" > active> auth_admin_ keep</allow_ active>
<allow_
So the question is, how should lightdm-gtk-greeter react to the "challenge" value it receives now (instead of "yes")?