我该如何解决这个警告？
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) ...
答案1
只需从内核 git 获取文件：
git clone https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
sudo cp ./linux-firmware/i915/icl_dmc_ver1_07.bin /lib/firmware/i915/icl_dmc_ver1_07.bin
答案2
此答案似乎是缺少英特尔图形驱动程序警告的最佳解决方案：
根据评论中的要求，似乎警告不会随着linux-firmware重新安装而消失：
$ sudo apt install --reinstall linux-firmware
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 9 not upgraded.
Need to get 49.8 MB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://ca.archive.ubuntu.com/ubuntu xenial-updates/main amd64 linux-firmware all 1.157.21 [49.8 MB]
Fetched 49.8 MB in 8s (5,542 kB/s)
(Reading database ... 495159 files and directories currently installed.)
Preparing to unpack .../linux-firmware_1.157.21_all.deb ...
Unpacking linux-firmware (1.157.21) over (1.157.21) ...
Setting up linux-firmware (1.157.21) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-47-generic
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
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
update-initramfs: Generating /boot/initrd.img-4.14.110-0414110-generic
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
update-initramfs: Generating /boot/initrd.img-4.14.98-041498-generic
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
update-initramfs: Generating /boot/initrd.img-4.14.89-041489-generic
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
update-initramfs: Generating /boot/initrd.img-4.14.78-041478-generic
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
update-initramfs: Generating /boot/initrd.img-4.14.70-041470-generic
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915
update-initramfs: Generating /boot/initrd.img-4.4.0-145-generic
update-initramfs: Generating /boot/initrd.img-3.16.60-031660-generic
答案3
在terminal...
sudo apt-get install --reinstall linux-firmware#重新安装固件
和
sudo pico /etc/default/grub# 编辑 grub 默认值
改变：
GRUB_HIDDEN_TIMEOUT=0
到：
#GRUB_HIDDEN_TIMEOUT=0
保存文件。退出编辑器。（control-o，return，control-x）
sudo update-grub# 更新 GRUB