~$ sudo update-initramfs -u 
update-initramfs: Generating /boot/initrd.img-4.8.0-22-generic
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module i915