Oh, I there's a typo in comment #10:
Workaround (2) should be

sudo sysctl -w kernel.sysrq=0

not =1.

This makes ALT+PrintScreen work for me for this session. So the problem
really is that PrintScreen also works as SysReq on Laptops. But
strangely, this was never a problem before? What has changed in 17.10?

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https://bugs.launchpad.net/bugs/1732612

Title:
  Alt+Printscreen not working (doesn't generate keypress event)

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