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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Screenshots do not work in Wayland session
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