I can reproduce this on my 18.04 laptop with zfs on root.

kdump-tools.postinst ends up calling /etc/kernel/postinst.d/kdump-tools 
4.15.0-23-generic, which fails at this mkinitramfs line:
mkinitramfs -d /var/lib/kdump/initramfs-tools -o 
/var/lib/kdump/initrd.img-4.15.0-23-generic.new 4.15.0-23-generic
mkinitramfs: failed to determine device for /

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https://bugs.launchpad.net/bugs/1661629

Title:
  upgrade of kernel fails with mkinitramfs: failed to determine device
  for /

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