Print Screen with Logitech MX Keys on Ubuntu 20.04

My net Logitech MX Keys keyboard doesn't have a regular Print Screen button anymore. Instead there is this camera/snipping tool button above the numpad.

  

This button does capture a screenshot in Ubuntu 20.04, but it lacks all the alternative methods.

Using the Solaar app, I have configured alternatives to take screenshots of;

• whole screen
• active window
• selected area
   

These are either stored in ~/Pictures or (with Control modifier) on the clipboard.

Enable the Snipping Tool Diversion:

 

I had to try out some different combinations of options for gnome-screenshot. Online were some suggestions. I have settled on two 'helpers'. Without these the command wouldn't work as expected.

• GDK_BACKEND=x11, to use/select the right clipboard
• -f /tmp/screenshot.png, to force taking the screenshot
  

Then configure rules for each alternative call.