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Permssions UI #1702
So there are two different cases here:
If we change the help text to "The user 'Scruffy' is not allowed to modify network settings" it would help usecase 1, and to some extent 2, even if it makes 2 feel a bit less natural.
I really like the disabled UI over the dialog in general. The dialog is very surprising with no indication that the action is impossible to do and cuts you off from the rest of the UI until you close it. I would in general advice against dialogs when there is only one action to perform (to close it in this case). This is also what is recommended by the GNOME HIG and by the book Designing Interfaces (by Jenifer Tidwell)