Ubuntu – Ubuntu 13.04 doesn’t show confirmation dialog for shutdown

13.04shutdown

After I updated to 13.04, Ubuntu immediately shuts down without confirmation when I press the power button. Also, it doesn't ask for confirmation if I select an otion from the top-right gear menu.
I tried setting the flag org.gnome.gnome-session.logout-prompt to true in dconf-editor and I set the power button action to "Interactive" in Tweak Tool.

Best Answer

I finally found the solution! Apparently the setting of /org/gnome/gnome-session/logout-prompt is ignored in newer Ubuntu versions, the right key was /apps/indicator-session/suppress-logout-restart-shutdown. So to fix this, do dconf write /apps/indicator-session/suppress-logout-restart-shutdown false in terminal. It should take effect immediately without restart. It seems that sometimes this value is set to „true“ by upgrade or third party applications.