This would certainly not be a bug in grub, which has nothing to do with
hibernate/resume handling.
What disk is the target for your hibernation? What are the contents of
the RESUME setting in your initramfs? (unmkinitramfs /boot/initrd.img
/tmp/initrd; cat /tmp/initrd/main/conf/conf.d/zz-auto-resume)
Resume from hibernation only works if you resume into the same kernel
after hibernation that you were running before hibernation. Is it
possible that you were rebooting into a different kernel version due to
kernel security updates having been applied?
** Package changed: grub (Ubuntu) => initramfs-tools (Ubuntu)
** Changed in: initramfs-tools (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1801551
Title:
ubuntu does not load the image from swap after hibernation
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