机器上装了双系统(Ubuntu 8.10+WinXP)，每次启动的时候如果不在Grub那里选择WinXP的话就会默认启动到Ubuntu。但是一般我都是用WinXP的，这样每次选择对我这种懒人来说太麻烦了，所以今天我就修改了Grub的配置，让它默认启动WinXP…
我们进入Ubuntu后，打开终端，先备份一下Grub的启动列表文件menu.lst：复制代码代码如下:sudo cp /boot/grub/menu.lst /boot/grub/menu.lst.bak然后使用Gedit来编辑menu.lst复制代码代码如下:sudo gedit /boot/grub/menu.lst打开以后会看到很长很长的东西，不过那些以"#"开头的东西全部都是没用的，而我们要修改的也只有一个地方(大概在18行左右)：default 0
这个0就代表了Grub默认启动项为Ubuntu，而我们要改成…这个因机而已了，我们往下看。# menu.lst – See: grub(8), info grub, update-grub(8)# grub-install(8), grub-floppy(8),# grub-md5-crypt, /usr/share/doc/grub# and /usr/share/doc/grub-doc/.
## default num# Set the default entry to the entry number NUM. Numbering starts from 0, and# the entry number 0 is the default if the command is not used.## You can specify \’saved\’ instead of a number. In this case, the default entry# is the entry saved with the command \’savedefault\’.# WARNING: If you are using dmraid do not use \’savedefault\’ or your# array will desync and will not let you boot your system.default 0
## timeout sec# Set a timeout, in SEC seconds, before automatically booting the default entry# (normally the first entry defined).timeout 10
## hiddenmenu# Hides the menu by default (press ESC to see the menu)#hiddenmenu
# Pretty colours#color cyan/blue white/blue
## password [\’–md5\’] passwd# If used in the first section of a menu file, disable all interactive editing# control (menu entry editor and command-line) and entries protected by the# command \’lock\’# e.g. password topsecret# password –md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/# password topsecret
## examples## title Windows 95/98/NT/2000# root (hd0,0)# makeactive# chainloader +1## title Linux# root (hd0,1)# kernel /vmlinuz root=/dev/hda2 ro#
## Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
### BEGIN AUTOMAGIC KERNELS LIST## lines between the AUTOMAGIC KERNELS LIST markers will be modified## by the debian update-grub script except for the default options below
## DO NOT UNCOMMENT THEM, Just edit them to your needs
## ## Start Default Options #### default kernel options## default kernel options for automagic boot options## If you want special options for specific kernels use kopt_x_y_z## where x.y.z is kernel version. Minor versions can be omitted.## e.g. kopt=root=/dev/hda1 ro## kopt_2_6_8=root=/dev/hdc1 ro## kopt_2_6_8_2_686=root=/dev/hdc2 ro# kopt=root=UUID=898431cf-4249-4de1-a492-7e2f4afd49a9 ro locale=zh_CN
## default grub root device## e.g. groot=(hd0,0)# groot=3738b672-62f3-490d-916a-cad379fdb57b
## should update-grub create alternative automagic boot options## e.g. alternative=true## alternative=false# alternative=true
## should update-grub lock alternative automagic boot options## e.g. lockalternative=true## lockalternative=false# lockalternative=false
## additional options to use with the default boot option, but not with the## alternatives## e.g. defoptions=vga=791 resume=/dev/hda5# defoptions=quiet splash
## should update-grub lock old automagic boot options## e.g. lockold=false## lockold=true# lockold=false
## Xen hypervisor options to use with the default Xen boot option# xenhopt=
## Xen Linux kernel options to use with the default Xen boot option# xenkopt=console=tty0
## altoption boot targets option## multiple altoptions lines are allowed## e.g. altoptions=(extra menu suffix) extra boot options## altoptions=(recovery) single# altoptions=(recovery mode) single
## controls how many kernels should be put into the menu.lst## only counts the first occurence of a kernel, not the## alternative kernel options## e.g. howmany=all## howmany=7# howmany=all
## should update-grub create memtest86 boot option## e.g. memtest86=true## memtest86=false# memtest86=true
## should update-grub adjust the value of the default booted system## can be true or false# updatedefaultentry=false
## should update-grub add savedefault to the default options## can be true or false# savedefault=false
## ## End Default Options ##
title Ubuntu 8.10, kernel 2.6.27-11-genericuuid 3738b672-62f3-490d-916a-cad379fdb57bkernel /vmlinuz-2.6.27-11-generic root=UUID=898431cf-4249-4de1-a492-7e2f4afd49a9 ro locale=zh_CN quiet splashinitrd /initrd.img-2.6.27-11-genericquiet
title Ubuntu 8.10, kernel 2.6.27-11-generic (recovery mode)uuid 3738b672-62f3-490d-916a-cad379fdb57bkernel /vmlinuz-2.6.27-11-generic root=UUID=898431cf-4249-4de1-a492-7e2f4afd49a9 ro locale=zh_CN singleinitrd /initrd.img-2.6.27-11-generic
title Ubuntu 8.10, kernel 2.6.27-7-genericuuid 3738b672-62f3-490d-916a-cad379fdb57bkernel /vmlinuz-2.6.27-7-generic root=UUID=898431cf-4249-4de1-a492-7e2f4afd49a9 ro locale=zh_CN quiet splashinitrd /initrd.img-2.6.27-7-genericquiet
title Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)uuid 3738b672-62f3-490d-916a-cad379fdb57bkernel /vmlinuz-2.6.27-7-generic root=UUID=898431cf-4249-4de1-a492-7e2f4afd49a9 ro locale=zh_CN singleinitrd /initrd.img-2.6.27-7-generic
title Ubuntu 8.10, memtest86+uuid 3738b672-62f3-490d-916a-cad379fdb57bkernel /memtest86+.binquiet
### END DEBIAN AUTOMAGIC KERNELS LIST# This is a divider, added to separate the menu items below from the Debian# ones.
title Other operating systems:root
# This entry automatically added by the Debian installer for a non-linux OS# on /dev/sda1
title Microsoft Windows XP Professionalroot (hd0,0)savedefaultmakeactivechainloader +1恩，我用了7种不同的颜色标记了下面的每一部分，依次编号为0、1、2、3、4、5、6。所以我们看到WinXP系统的编号是6，所以我们只要把 default 0 修改为 default 6 就可以了。
这个是我的电脑，XP的编号为6，你的电脑需要你自己去看是多少。
PS.这里有个技巧，你需要数有多少个title就可以啦，哈哈！
另外上面我不同颜色标记的东西是可以删除的，删除以后Grub启动列表里的对应项目就会消失，貌似可以美观一些，嘎嘎…
