Yes, it actually is a GNOME Shell design decision. You can press the
Escape key or click the Close button to close these dialogs. If you find
a dialog like this without a Close button, please file a bug.
I'm going to go ahead and close this bug since this isn't Ubuntu's
decision.
** Changed in: gnome-shell (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/885711
Title:
dialogs without windows close button in gnome-shell
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