Screenshots using the PrtScn key do work in a a Wayland session on 17.10. I 
just tested it again:
  PrtScn = whole screen saved to Pictures/
  Alt+PrtScn = current window saved to Pictures/
  Shift+PtrScn = select a rectangle, then saved to Pictures/

If your home directory does not contain a Pictures directory already
then the images are saved to your home directory instead (apparently).
Please try these options and if you still can't get it working then...

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  apport-collect 1709780
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  Screenshots do not work in Wayland session

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