ubuntu更改启动顺序

时间：2021-05-12 02:09:57

在ubuntu中修改启动配置。

启动相关grub2主要包含下面三个文件：1.   /boot/grub/grub.cfg 文件    2.   /etc/grub.d/ 文件夹   3.   /etc/default/grub 文件，可以通过修改这三个文件来修改启动项

链接：http://blog.csdn.net/zhu_liangwei/article/details/7847034

一

更改启动顺序，验证过的两种方式

1、修改 /etc/default/grub 文件

打开文件

sudo gedit /etc/default/grub

修改文件

GRUB_DEFAULT=0     #更改数字设置默认启动项

更新

sudo update-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=7     #更改数字设置默认启动项

 #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"




配置文件详解 http://lesca.me/archives/manage-grub2-config-file.html


ubuntu更改启动顺序


二


修改 /boot/grub/grub.cfg文件，使用sudo update-grub会被覆盖掉。


打开文件


sudo gedit /boot/grub/grub.cfg


修改文件


set default = '0'   修改数字


 




 #

 # DO NOT EDIT THIS FILE

 #

 # It is automatically generated by grub-mkconfig using templates

 # from /etc/grub.d and settings from /etc/default/grub

 #

 ### BEGIN /etc/grub.d/00_header ###

 if [ -s $prefix/grubenv ]; then

   set have_grubenv=true

   load_env

 fi

 set default=""    #改这个数字设置默认启动项，启动项的特征在下面有标记

 if [ "${prev_saved_entry}" ]; then

   set saved_entry="${prev_saved_entry}"

   save_env saved_entry

   set prev_saved_entry=

   save_env prev_saved_entry

   set boot_once=true

 fi

 function savedefault {

   if [ -z "${boot_once}" ]; then

     saved_entry="${chosen}"

     save_env saved_entry

   fi

 }

 function recordfail {

   set recordfail=1

   if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi

 }

 function load_video {

   insmod vbe

   insmod vga

   insmod video_bochs

   insmod video_cirrus

 }

 insmod part_msdos

 insmod ext2

 set root='(hd0,msdos7)'

 search --no-floppy --fs-uuid --set=root dea69c19-08d2-433a-89b9-f917b6d5cce4

 if loadfont /usr/share/grub/unicode.pf2 ; then

   set gfxmode=auto

   load_video

   insmod gfxterm

   insmod part_msdos

   insmod ext2

   set root='(hd0,msdos7)'

   search --no-floppy --fs-uuid --set=root dea69c19-08d2-433a-89b9-f917b6d5cce4

   set locale_dir=($root)/boot/grub/locale

   set lang=zh_CN

   insmod gettext

 fi

 terminal_output gfxterm

 if [ "${recordfail}" = 1 ] ; then

   set timeout=30

 else

   set timeout=10

 fi

 ### END /etc/grub.d/00_header ###

 ### BEGIN /etc/grub.d/05_debian_theme ###

 set menu_color_normal=white/black

 set menu_color_highlight=black/light-gray

 if background_color 44,0,30; then

   clear

 fi

 ### END /etc/grub.d/05_debian_theme ###

 ### BEGIN /etc/grub.d/10_linux ###

 function gfxmode {

     set gfxpayload="${1}"

     if [ "${1}" = "keep" ]; then

         set vt_handoff=vt.handoff=7

     else

         set vt_handoff=

     fi

 }

 if [ "${recordfail}" != 1 ]; then

   if [ -e ${prefix}/gfxblacklist.txt ]; then

     if hwmatch ${prefix}/gfxblacklist.txt 3; then

       if [ ${match} = 0 ]; then

         set linux_gfx_mode=keep

       else

         set linux_gfx_mode=text

       fi

     else

       set linux_gfx_mode=text

     fi

   else

     set linux_gfx_mode=keep

   fi

 else

   set linux_gfx_mode=text

 fi

 export linux_gfx_mode

 if [ "${linux_gfx_mode}" != "text" ]; then load_video; fi
#********************这是一个启动项，启动项0，红色的是启动项名字

101 menuentry 'Ubuntu，Linux 3.2.0-101-generic' --class ubuntu --class gnu-linux --class gnu --class os {

102     recordfail

103     gfxmode $linux_gfx_mode

104     insmod gzio

105     insmod part_msdos

106     insmod ext2

107     set root='(hd0,msdos7)'

108     search --no-floppy --fs-uuid --set=root dea69c19-08d2-433a-89b9-f917b6d5cce4

109     linux    /boot/vmlinuz-3.2.0-101-generic root=UUID=dea69c19-08d2-433a-89b9-f917b6d5cce4 ro   quiet splash $vt_handoff

110     initrd    /boot/initrd.img-3.2.0-101-generic

111 }


#********************这是一个启动项，启动项1

 menuentry 'Ubuntu, with Linux 3.2.0-101-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {

     recordfail

     insmod gzio

     insmod part_msdos

     insmod ext2

     set root='(hd0,msdos7)'

     search --no-floppy --fs-uuid --set=root dea69c19-08d2-433a-89b9-f917b6d5cce4

     echo    '载入 Linux 3.2.0-101-generic ...'

     linux    /boot/vmlinuz-3.2.0-101-generic root=UUID=dea69c19-08d2-433a-89b9-f917b6d5cce4 ro recovery nomodeset

     echo    '载入初始化内存盘...'

     initrd    /boot/initrd.img-3.2.0-101-generic

 }


 




#********************这是一个启动项，启动项2


 menuentry 'Ubuntu，Linux 3.19.0-68-generic' --class ubuntu --class gnu-linux --class gnu --class os { 
  recordfail 
  gfxmode $linux_gfx_mode 
  insmod gzio 
  insmod part_msdos 
  insmod ext2 
 set root='(hd0,msdos7)' 
 search --no-floppy --fs-uuid --set=root dea69c19-08d2-433a-89b9-f917b6d5cce4 
 linux /boot/vmlinuz-3.19.0-68-generic root=UUID=dea69c19-08d2-433a-89b9-f917b6d5cce4 ro quiet splash $vt_handoff 
 initrd /boot/initrd.img-3.19.0-68-generic
 } 

后边的代码太多删了
submenu "Previous Linux versions" 算一个，在启动时选择该项，能选择里面的启动内核




谨慎修改grub
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