This was based on a fresh install of the 18.04 alpha release (daily image of 7 
feb). 
- system has luks keyword (not random) encrypted cryptoswap
- hardware swsusp (systemctl hibernate) fails, and generated this message
- because of this bug (-> 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1743094 ) I already 
upgraded to 4.14.13-041413-generic which did not solve this issue
- using uswsusp s2disk works well with the 4.14 kernel and 18.04.
- previously on 16.04.3, I downgraded to kernel 4.10, and used hardware swsusp 
without issues. 
- will try 4.15

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https://bugs.launchpad.net/bugs/1747750

Title:
  [LENOVO 20KSCTO1WW] hibernate/resume failure

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