ubuntu 18.04, the same:
update-initramfs -c -k all
update-initramfs: Generating /boot/initrd.img-4.15.0-38-generic
cryptsetup: WARNING: invalid line in /etc/crypttab for luks-9013e4bc-3ea3-4379-957c-88e2bbb701c1 -
update-initramfs: Generating /boot/initrd.img-4.15.0-29-generic
cryptsetup: WARNING: invalid line in /etc/crypttab for luks-9013e4bc-3ea3-4379-957c-88e2bbb701c1 -
ubuntu 18.04, the same: img-4.15. 0-38-generic 3ea3-4379- 957c-88e2bbb701 c1 - img-4.15. 0-29-generic 3ea3-4379- 957c-88e2bbb701 c1 -
update-initramfs -c -k all
update-initramfs: Generating /boot/initrd.
cryptsetup: WARNING: invalid line in /etc/crypttab for luks-9013e4bc-
update-initramfs: Generating /boot/initrd.
cryptsetup: WARNING: invalid line in /etc/crypttab for luks-9013e4bc-