I found part of the kernel log describing the failed boot.
Line 642 seems relevant:
Jan 21 09:12:41 laptop kernel: [ 1.254367] PM: Hibernation image
not present or could not be loaded.
** Attachment added: "resumefail.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1743094/+attachment/5040558/+files/resumefail.log
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https://bugs.launchpad.net/bugs/1743094
Title:
hibernation broken (freezes with resume) in kernel linux-
image-4.13.0-26-generic
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