Comment 2 for bug 1769297

How to check you have this issue:

1) get provided resume script, replace /usr/share/initramfs-tools/scripts/local-premount/resume with it
2) sudo update-initramfs -k $(uname -r) -u
3) sudo systemctl hibernate
4) edit grub menu entry, add 'debug' parameter to kernel command line, boot
5) look into /run/initramfs/initramfs.debug, if you see following lines, you have this issue:
+ /scripts/local-premount/resume
Success: Resume device: 'UUID=106238b0-707d-4422-866d-a7534da50702' ()
Failure: Failed to get /sys/class/block//dev major/minor