Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-control-center (Ubuntu)
Status: New = Confirmed
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A work-around is to add the package 'nvidia-settings' and use that to
set up mirroring. However, it would be best to get it fixed in gnome-
control-center. The control center works otherwise but mirroring is
really needed when doing presentations because it is necessary to see on
the laptop