内核源码下载地址：

https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/linux-4.4.1.tar.gz

安装依赖包：报错就装

cp /boot/config-xxx ./.config

make mrproper

make menuconfig,然后save保存，退出

make -j4 //四线程编译

 sudo make modules_install 

执行完这个命令，在/lib/modules目录生成4.4.1名字的目录

lkmao@MiWiFi-R3600-srv:~/netmap/kernel/linux-4.4.1$ ls /lib/modules/
4.4.0-186-generic  4.4.1
lkmao@MiWiFi-R3600-srv:~/netmap/kernel/linux-4.4.1$ 

 sudo make bzImage 

lkmao@MiWiFi-R3600-srv:~/netmap/kernel/linux-4.4.1$ ls arch/x86/boot/bzImage -lsh
6.7M -rw-r--r-- 1 root root 6.7M May  3 21:16 arch/x86/boot/bzImage
lkmao@MiWiFi-R3600-srv:~/netmap/kernel/linux-4.4.1$ 

 sudo cp arch/x86/boot/bzImage /boot/vmlinuz-4.4.1
 sudo cp .config /boot/config-4.4.1
cd /lib/modules/4.4.1/

 sudo update-initramfs -c -k 4.4.1
 

lkmao@MiWiFi-R3600-srv:/lib/modules/4.4.1$ sudo update-initramfs -c -k 4.4.1
update-initramfs: Generating /boot/initrd.img-4.4.1
lkmao@MiWiFi-R3600-srv:/lib/modules/4.4.1$ 

 sudo update-grub
 

lkmao@MiWiFi-R3600-srv:/lib/modules/4.4.1$ sudo update-grub
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-4.4.1
Found initrd image: /boot/initrd.img-4.4.1
Found linux image: /boot/vmlinuz-4.4.0-186-generic
Found initrd image: /boot/initrd.img-4.4.0-186-generic
done
lkmao@MiWiFi-R3600-srv:/lib/modules/4.4.1$ 

重启后查看版本：

lkmao@MiWiFi-R3600-srv:~$ cat /proc/version 
Linux version 4.4.1 (root@MiWiFi-R3600-srv) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12) ) #1 SMP Wed May 3 21:15:50 PDT 2023
lkmao@MiWiFi-R3600-srv:~$ 

好了，内核更换成功了。