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There's no visual notification when the power action is inhibited. When the user cannot select poweroff/reboot [s]he doesn't know why so please display at least the "why" (and maybe "who") parameter of inhibition.
I encourage you to submit feature requests upstream to https://launchpad.net/ubuntu/+source/lightdm-gtk-greeter (we in fedora are unlikely to have the resources to implement it ourselves)
Thanks, will continue tracking the feature there