package:initramfs-tools:0.122ubuntu8.1
Processing triggers for initramfs-tools (0.122ubuntu8.1) ...
update-initramfs: Generating /boot/initrd.img-4.4.0-31-generic
cryptsetup: WARNING: failed to detect canonical device of overlay
cryptsetup: WARNING: could not determine root device from /etc/fstab
cp: cannot create regular file '/cdrom/casper/initrd.gz.new': No such file or directory
dpkg: error processing package initramfs-tools (--configure):
 subprocess installed post-installation script returned error exit status 1