利用grub设置ubuntu内核_ubuntu开机选择内核grub

1、查看内核

ubuntu@ubun:sudo dpkg --get-selections |grep linux-image
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2、更改/etc/default/grub

ubuntu@ubun:/usr/local$ cat /etc/default/grub


#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=0
***GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 4.15.0-72-generic"***
#GRUB_DEFAULT="1> 2"
#GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="text"
#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"
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3、生效：update-grub

ubuntu@ubun: sudo update-grub
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4、重新启动，现在应该默认启动旧的内核版本

ubuntu@ubun: sudo reboot
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