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reference
https://www.cnblogs.com/leebri/p/16786685.html

前往此网站，找到所需的内核
https://kernel.ubuntu.com/~kernel-ppa/mainline/
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查看系统架构
dpkg --print-architecture

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二、下载安装包
注意：下载除lowlatency以外的deb包

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三、安装内核
3.1 进入安装包保存目录
将这三个 deb 下载至同一目录

cd ~/Downloads && mkdir kernel && cd ./kernel
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.100/linux-headers-4.9.100-0409100_4.9.100-0409100.201805160931_all.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.100/linux-headers-4.9.100-0409100-generic_4.9.100-0409100.201805160931_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.100/linux-image-4.9.100-0409100-generic_4.9.100-0409100.201805160931_amd64.deb

cd ~/Downloads/kernel
3.2 安装
sudo dpkg -i *.deb
查看已安装的内核版本dpkg --list | grep linux-image

neu@neu-ubuntu20:~$ dpkg --list | grep linux-image
ii  linux-image-4.15.18-041518-generic         4.15.18-041518.201804190330         amd64        Linux kernel image for version 4.15.18 on 64 bit x86 SMP
ii  linux-image-4.9.100-0409100-generic        4.9.100-0409100.201805160931        amd64        Linux kernel image for version 4.9.100 on 64 bit x86 SMP
rc  linux-image-5.11.0-27-generic              5.11.0-27.29~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.13.0-40-generic              5.13.0-40.45~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.13.0-41-generic              5.13.0-41.46~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.13.0-44-generic              5.13.0-44.49~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.13.0-48-generic              5.13.0-48.54~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.13.0-51-generic              5.13.0-51.58~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.13.0-52-generic              5.13.0-52.59~20.04.1                amd64        Signed kernel image generic
ii  linux-image-5.15.0-41-generic              5.15.0-41.44~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.15.0-43-generic              5.15.0-43.46~20.04.1                amd64        Signed kernel image generic
rc  linux-image-5.15.0-46-generic              5.15.0-46.49~20.04.1                amd64        Signed kernel image generic
ii  linux-image-5.15.0-48-generic              5.15.0-48.54~20.04.1                amd64        Signed kernel image generic
ii  linux-image-5.4.0-128-generic              5.4.0-128.144                       amd64        Signed kernel image generic
ii  linux-image-extra-virtual                  5.4.0.128.129                       amd64        Extra drivers for Virtual Linux kernel image
ii  linux-image-generic                        5.4.0.128.129                       amd64        Generic Linux kernel image
ii  linux-image-generic-hwe-20.04              5.15.0.48.54~20.04.18               amd64        Generic Linux kernel image

可以看到内核版本4.9.100-0409100-generic已成功安装。
3.3 更新
如果直接使用此内核重启，在启动时会出现以下错误：

Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
这就需要update-initramfs和更新grub。

将4.9.100-0409100-generic替换你需要的version

sudo update-initramfs -u -k 4.9.100-0409100-generic
修改grub使4.9.100-0409100-generic为默认启动项

sudo nano /etc/default/grub
将GRUB_DEFAULT一项修改为：

“Advanced options for Ubuntu>Ubuntu, with Linux 4.9.100-0409100-generic”
同理，记得把4.9.100-0409100-generic替换你需要的version

image

更新grub
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sudo update-grub
四、查看是否安装成功
重启后，查看内核版本。

sudo reboot
uname -r
如果输出为要安装的内核版本，则操作成功。

neu@neu-ubuntu20:~$ uname -r
4.9.100-0409100-generic