ubuntu@ubuntu:~$ sudo mount /dev/sdb1 /mnt/boot; sudo chroot /mnt
root@ubuntu:/# update-initramfs -u -k all
update-initramfs: Generating /boot/initrd.img-3.16.0-57-generic
^[[A^[[A^[[B^[[B^[[B^[^[cryptsetup: WARNING: invalid line in /etc/crypttab for luks-b5601cb8-b122-44e8-a267-ffcda4342590 -
cryptsetup: WARNING: invalid line in /etc/crypttab for luks-b5601cb8-b122-44e8-a267-ffcda4342590 -
update-initramfs: Generating /boot/initrd.img-3.16.0-55-generic
cryptsetup: WARNING: invalid line in /etc/crypttab for luks-b5601cb8-b122-44e8-a267-ffcda4342590 -
cryptsetup: WARNING: invalid line in /etc/crypttab for luks-b5601cb8-b122-44e8-a267-ffcda4342590 -