It works on Ubuntu 17.04 with Unity, however neither via upgrade or a fresh install, does the screenshot keyboard button work on Ubuntu 17.10 with GNOME shell.
Can anyone tell me why or how to fix it?
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The PrtScr/Print key still works – but now (U17.10) has different actions bound to it. Go to
Settings → Devices → Keyboard
and scroll down to Screenshots. It shows
Now once you press PrintScreen,
gnome-screenshot captures a screenshot and saves it in
~/Pictures/ without asking the user.
You may set a custom keyboard shortcut to launch
gnome-screenshot in interactive mode, i.e. when the following window appears providing the user some choices:
and the options to save or discard the screenshot, chose location to save etc. after capturing.
To set the custom shortcut follow the steps from this answer.