Ubuntu SetDefaultKernel

[junxnone]

设置默认 Kernel

• OS: Ubuntu 22.04

查看安装了哪些 Kernel

• 查看文件 /boot/grub/grub.cfg

cat /boot/grub/grub.cfg | grep menuentry

$ 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-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
        menuentry 'Ubuntu, with Linux 5.19.0-35-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.19.0-35-generic-advanced-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
        menuentry 'Ubuntu, with Linux 5.19.0-35-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.19.0-35-generic-recovery-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
        menuentry 'Ubuntu, with Linux 5.17.0-1020-oem' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.17.0-1020-oem-advanced-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
        menuentry 'Ubuntu, with Linux 5.17.0-1020-oem (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.17.0-1020-oem-recovery-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
        menuentry 'Ubuntu, with Linux 5.15.0-67-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-67-generic-advanced-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
        menuentry 'Ubuntu, with Linux 5.15.0-67-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.0-67-generic-recovery-a103aef9-a8e9-4ac1-82f8-1dd8440c9ed1' {
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {

设置 第 N 个 Kernel

• /etc/default/grub

GRUB_DEFAULT="1> 0"

1: 第一个菜单
0: 第二个菜单第一项

• 更改 0 对应的内核,即 submenu 中 menuentry 对应的位置

更新 Grub

sudo update-grub

Reboot

sudo reboot

Reference

• Ubuntu安装、卸载和更换默认kernel