Setting up linux-image-4.9.0-9-amd64 (4.9.168-1+deb9u4) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.9.0-9-amd64
W: initramfs-tools configuration sets RESUME=UUID=9c71f919-9a5e-44c9-81d0-ff742bf2418d
W: but no matching swap device is available.
I: The initramfs will attempt to resume from /dev/md0
I: (UUID=f776acb0-ffcb-488f-b394-4b203186d6a4)
I: Set the RESUME variable to override this.