Ubuntu切换系统内核-马春杰杰

想切换不同系统内核怎么办？按下面步骤即可：

第一步：查找内核：grep submenu /boot/grub/grub.cfg

submenu 'Ubuntu 高级选项' $menuentry_id_option 'gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {

1	submenu 'Ubuntu 高级选项' $menuentry_id_option 'gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {

第二步：查找想要使用的内核 grep gnulinux /boot/grub/grub.cfg

$  grep gnulinux /boot/grub/grub.cfg
   set default="gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e>gnulinux-4.4.248-0404248-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e"
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-3f5e97d5-cd08-4560-94df-613149aac32e' {
submenu 'Ubuntu 高级选项' $menuentry_id_option 'gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu，Linux 4.15.1-041501-lowlatency' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-lowlatency-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.15.1-041501-lowlatency (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-lowlatency-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.15.1-041501-lowlatency (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-lowlatency-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu，Linux 4.15.1-041501-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.15.1-041501-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-generic-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.15.1-041501-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu，Linux 4.4.248-0404248-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.248-0404248-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.4.248-0404248-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.248-0404248-generic-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.4.248-0404248-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.248-0404248-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu，Linux 4.4.0-141-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-141-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.4.0-141-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-141-generic-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {
        menuentry 'Ubuntu, with Linux 4.4.0-141-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-141-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {

$ grep gnulinux /boot/grub/grub.cfg

set default="gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e>gnulinux-4.4.248-0404248-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e"

menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-3f5e97d5-cd08-4560-94df-613149aac32e' {

submenu 'Ubuntu 高级选项' $menuentry_id_option 'gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu，Linux 4.15.1-041501-lowlatency' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-lowlatency-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.15.1-041501-lowlatency (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-lowlatency-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.15.1-041501-lowlatency (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-lowlatency-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu，Linux 4.15.1-041501-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.15.1-041501-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-generic-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.15.1-041501-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.1-041501-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu，Linux 4.4.248-0404248-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.248-0404248-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.4.248-0404248-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.248-0404248-generic-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.4.248-0404248-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.248-0404248-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu，Linux 4.4.0-141-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-141-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.4.0-141-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-141-generic-init-upstart-3f5e97d5-cd08-4560-94df-613149aac32e' {

menuentry 'Ubuntu, with Linux 4.4.0-141-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.4.0-141-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e' {

选择我们想要切换的内核，这里我选择的为：gnulinux-4.4.248-0404248-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e

第三步：修改grub文件，切换内核：vim /etc/default/grub，根据第一步和第二步得到的内核，修改为下面高亮行：

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

#GRUB_DEFAULT="gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e>gnulinux-4.4.0-141-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e"
#GRUB_DEFAULT="gnulinux-4.4.0-141-generic-recovery-3f5e97d5-cd08-4560-94df-613149aac32e>gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e"
GRUB_DEFAULT="gnulinux-advanced-3f5e97d5-cd08-4560-94df-613149aac32e>gnulinux-4.4.248-0404248-generic-advanced-3f5e97d5-cd08-4560-94df-613149aac32e"
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"