thank you, people - restarting (Alt-F2 > r) indeed gets rid of the window. 
Do we know what causes it? 
How to fix? 

Ubuntu 20.04 running Gnome-Vanilla desktop with nvidia-driver
is this related to snap by any chance? Or to the new disk that I added to my 
system recently? 

can I provide any logs?

cheers

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https://bugs.launchpad.net/bugs/1824874

Title:
  undismissable, unclickable authentication dialog left on screen (top-
  left corner) after policykit authentication [pushModal: invocation of
  begin_modal failed]

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