解决'sudo update-initramfs -u'提示固件缺失问题

1、问题：

yk@yk-pc:~$ sudo update-initramfs -u
W: Possible missing firmware /lib/firmware/rtl_nic/rtl8105e-1.fw for module r816
9
W: Possible missing firmware /lib/firmware/rtl_nic/rtl8168e-3.fw for module r816
9
W: Possible missing firmware /lib/firmware/i915/tgl_dmc_ver2_08.bin for module i915
W: Possible missing firmware /lib/firmware/i915/rkl_dmc_ver2_02.bin for module i915

2、解决

[先进入缺失文件的文件夹]或者在wget后加 -P+路径，如： wget -P /lib/firmware/rtl_nic https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8107e-2.fw

yk@yk-pc:/lib/firmware/rtl_nic$ sudo wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8107e-2.fw

yk@yk-pc:/lib/firmware/i915$ sudo wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/bxt_guc_33.0.0.bin

3、批量下载

wget -i list.txt

把所有需要下载文件的地址放到 list.txt 中

如：
(1)firmware_i915.txt内容如下：

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/skl_huc_2.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/skl_guc_33.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/bxt_huc_2.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/bxt_guc_33.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/kbl_huc_4.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/kbl_guc_33.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/glk_huc_4.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/glk_guc_33.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/kbl_huc_4.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/kbl_guc_33.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/cml_huc_4.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/cml_guc_33.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/icl_huc_9.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/icl_guc_33.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/ehl_huc_9.0.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/ehl_guc_33.0.4.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/tgl_huc_7.5.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/tgl_guc_35.2.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/tgl_huc_7.5.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/tgl_guc_35.2.0.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/bxt_dmc_ver1_07.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/skl_dmc_ver1_27.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/kbl_dmc_ver1_04.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/glk_dmc_ver1_04.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/cnl_dmc_ver1_07.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/icl_dmc_ver1_09.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/tgl_dmc_ver2_08.bin
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/i915/rkl_dmc_ver2_02.bin

输入命令：

sudo wget -P /lib/firmware/i915/ -i /path/to/firmware_i915.txt

(2)firmware_rtl_nic.txt文件内容如下：

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8125b-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8125a-3.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8107e-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8107e-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168fp-3.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168h-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168h-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168g-3.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168g-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8106e-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8106e-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8411-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8411-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8402-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168f-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168f-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8105e-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168e-3.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168e-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168e-1.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168d-2.fw
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/rtl_nic/rtl8168d-1.fw

输入命令：

sudo wget -P /lib/firmware/rtl_nic/ -i /path/to/firmware_rtl_nic.txt

部分参数含义：

-P 表示下载到哪个目录
-r 表示递归下载
-np 表示不下载旁站连接.
-k 表示将下载的网页里的链接修改为本地链接.
-p 获得所有显示网页所需的元素

参考：
Linux wget命令详解