1. 安装新的内核版本
推荐使用 apt 源安装，避免安装了不兼容的内核版本。
1.1 源安装
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| apt list linux-headers-5.15.*-*-generic linux-image-5.15.*-*-generic
linux-image-5.15.0-94-generic/focal-updates,focal-security 5.15.0-94.104~20.04.1 amd64
linux-image-5.15.0-97-generic/focal-updates,focal-security 5.15.0-97.107~20.04.1 amd64
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| apt install linux-image-5.15.0-97-generic linux-headers-5.15.0-94-generic
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1.2 自行下载安装
需要先确认下当前的系统与目标内核版本是否兼容。
http://kernel.ubuntu.com/~kernel-ppa/mainline/
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| wget https://kernel.ubuntu.com/mainline/v5.19/amd64/linux-headers-5.19.0-051900-generic_5.19.0-051900.202207312230_amd64.deb
wget amd64/linux-headers-5.19.0-051900_5.19.0-051900.202207312230_all.deb
wget https://kernel.ubuntu.com/mainline/v5.19/amd64/linux-image-unsigned-5.19.0-051900-generic_5.19.0-051900.202207312230_amd64.deb
wget https://kernel.ubuntu.com/mainline/v5.19/amd64/linux-modules-5.19.0-051900-generic_5.19.0-051900.202207312230_amd64.deb
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2. 切换默认内核版本
2.1 查看当前版本
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| uname -r
5.15.0-1033-aws
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2.2 查看可用的版本
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| dpkg --get-selections | grep linux-image
linux-image-5.15.0-1033-aws install
linux-image-5.15.0-1072-aws install
linux-image-5.15.0-97-generic install
linux-image-aws install
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2.3 查看 grub 引导标识
在 Ubuntu 中，引导有两级标识。
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| cat /boot/grub/grub.cfg | grep submenu
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输出示例：
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| submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
submenu 'Advanced options for Ubuntu 20.04.6 LTS (20.04) (on /dev/nvme0n1p1)' $menuentry_id_option 'osprober-gnulinux-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
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以 Advanced options for Ubuntu 为例，记录下 gnulinux-advanced-4b727438-7c0b-4757-a56f-24bd780b3527 作为引导的一级标识。
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| cat /boot/grub/grub.cfg | grep menuentry
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输出示例：
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| cat /boot/grub/grub.cfg | grep submenu
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
submenu 'Advanced options for Ubuntu 20.04.6 LTS (20.04) (on /dev/nvme0n1p1)' $menuentry_id_option 'osprober-gnulinux-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
root@aws-mx-ai-kas-gpu-l40s-02:~#
root@aws-mx-ai-kas-gpu-l40s-02:~# cat /boot/grub/grub.cfg | grep menuentry
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
menuentry_id_option=""
export menuentry_id_option
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-4b727438-7c0b-4757-a56f-24bd780b3527' {
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
menuentry 'Ubuntu, with Linux 5.15.0-1072-aws' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-1072-aws-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
menuentry 'Ubuntu, with Linux 5.15.0-1072-aws (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-1072-aws-recovery-4b727438-7c0b-4757-a56f-24bd780b3527' {
menuentry 'Ubuntu, with Linux 5.15.0-1033-aws' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-1033-aws-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
menuentry 'Ubuntu, with Linux 5.15.0-1033-aws (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-1033-aws-recovery-4b727438-7c0b-4757-a56f-24bd780b3527' {
menuentry 'Ubuntu, with Linux 5.15.0-97-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-97-generic-advanced-4b727438-7c0b-4757-a56f-24bd780b3527' {
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以 Ubuntu, with Linux 5.15.0-1033-aws 为例，记录下 gnulinux-5.15.0-1033-aws-advanced-4b727438-7c0b-4757-a56f-24bd780b3527 作为引导的二级标识。
2.4 编辑引导文件
按照 Ubuntu 的两级引导标识，指引引导程序加载指定的内核版本。
将 GRUB_DEFAULT=0 改为：
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| GRUB_DEFAULT="gnulinux-advanced-4b727438-7c0b-4757-a56f-24bd780b3527>gnulinux-5.15.0-1033-aws-advanced-4b727438-7c0b-4757-a56f-24bd780b3527"
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也可以按照索引顺序写成（从 0 开始）：
或者使用语义标识
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| GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 5.15.0-1033-aws"
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重启之后，查看内核版本：
