I too see the same thing on Ubuntu 16.04. Using the Show Copy Dialog doesn't help because it just brings up another instance of Nautilus, not the copy dialog. Alt-Tab cycles through that, not the copy dialog.
I too see the same thing on Ubuntu 16.04. Using the Show Copy Dialog doesn't help because it just brings up another instance of Nautilus, not the copy dialog. Alt-Tab cycles through that, not the copy dialog.