Further explanation: Legacy screenshot tools that use X11 will not work
in a Wayland session. This is because X has no control over the screen.
It is Wayland rendering the screen. So if you run any legacy
screenshotting tool, it will connect to Xwayland and Xwayland will just
see all black. This is expected and some would say is a security
feature.

As Jeremy said, you need to use different screenshotting techniques in a
Wayland session.

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https://bugs.launchpad.net/bugs/1709780

Title:
  Screenshots do not work in Wayland session

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