Ubuntu – help! W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915

How can I solve this warning?

addgroup: The group `input' already exists as a system group. Exiting.
update-initramfs: deferring update (trigger activated)
Setting up grub-common (2.02~beta2-36ubuntu3.21) ...
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Setting up grub2-common (2.02~beta2-36ubuntu3.21) ...
Setting up grub-efi-amd64-bin (2.02~beta2-36ubuntu3.21) ...
Setting up grub-efi-amd64 (2.02~beta2-36ubuntu3.21) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.15.0-46-generic
Found initrd image: /boot/initrd.img-4.15.0-46-generic
Found linux image: /boot/vmlinuz-4.15.0-45-generic
Found initrd image: /boot/initrd.img-4.15.0-45-generic
Adding boot menu entry for EFI firmware configuration
done
Setting up grub-efi-amd64-signed (1.66.21+2.02~beta2-36ubuntu3.21) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
Setting up busybox-initramfs (1:1.22.0-15ubuntu1.4) ...
Setting up busybox-static (1:1.22.0-15ubuntu1.4) ...
Setting up libpolkit-gobject-1-0:amd64 (0.105-14.1ubuntu0.5) ...
Setting up libpolkit-agent-1-0:amd64 (0.105-14.1ubuntu0.5) ...
Setting up libpolkit-backend-1-0:amd64 (0.105-14.1ubuntu0.5) ...
Setting up libpq5:amd64 (9.5.16-0ubuntu0.16.04.1) ...
Setting up linux-libc-dev:amd64 (4.4.0-145.171) ...
Setting up linux-signed-generic-hwe-16.04 (4.15.0.47.68) ...
Setting up policykit-1 (0.105-14.1ubuntu0.5) ...
Removed symlink /run/systemd/system/polkitd.service.
Processing triggers for initramfs-tools (0.122ubuntu8.14) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-46-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
Processing triggers for shim-signed (1.33.1~16.04.4+15+1533136590.3beb971-0ubuntu1) ...
Processing triggers for libc-bin (2.23-0ubuntu11) ...