Also tried with qdbus with the following line (as I'm using KDE) :
qdbus --system org.freedesktop.login1 /org/freedesktop/login1 
org.freedesktop.login1.Manager.CanReboot
Error: org.freedesktop.DBus.Error.Spawn.ExecFailed
Cannot launch daemon, file not found or permissions invalid

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https://bugs.launchpad.net/bugs/1295521

Title:
  cannot shutdown/suspend/restart from the GUI

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