Menu.lst 内容如下，尽可能详细说出步骤哦！

# 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=0a7198c2-1ca8-405e-b607-637ed138b7db ro locale=zh_CN

## default grub root device
## e.g. groot=(hd0,0)
# groot=bea908af-4a86-4b3c-ad67-22e7aed0578a

## 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

## specify if running in Xen domU or have grub detect automatically
## update-grub will ignore non-xen kernels when running in domU and vice versa
## e.g. indomU=detect
## indomU=true
## indomU=false
# indomU=detect

## 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 9.04, kernel 2.6.28-11-generic
uuid bea908af-4a86-4b3c-ad67-22e7aed0578a
kernel /vmlinuz-2.6.28-11-generic root=UUID=0a7198c2-1ca8-405e-b607-637ed138b7db ro locale=zh_CN quiet splash
initrd /initrd.img-2.6.28-11-generic
quiet

title Ubuntu 9.04, kernel 2.6.28-11-generic (recovery mode)
uuid bea908af-4a86-4b3c-ad67-22e7aed0578a
kernel /vmlinuz-2.6.28-11-generic root=UUID=0a7198c2-1ca8-405e-b607-637ed138b7db ro locale=zh_CN single
initrd /initrd.img-2.6.28-11-generic

title Ubuntu 9.04, memtest86+
uuid bea908af-4a86-4b3c-ad67-22e7aed0578a
kernel /memtest86+.bin
quiet

### 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 Professional
rootnoverify (hd0,0)
savedefault
makeactive
chainloader +1

1)
从第一个title开始数到要默认启动的选项的title N , 然后将default后面的数改成 N-1
2)
把XP到最后的内容复制到title 9.04 之前,(不修改default)

哈哈楼主的这个文件内容跟我的一样，我的也开机就默认进ub郁闷啊，解决问题了楼主告诉我一下啊，汗

不拘于命令行的朋友，可以试下startupmanager，新立得里就有。

如果你的电脑安装了Ubuntu和Windows双系统的话，可以在Ubuntu中使用startupmanager这个软件来调整启动菜单的顺序，比如把Ubuntu或Windows设为默认的操作系统，还可以设置等待选择的时间。
安装方法：在新立德软件包管理器里搜索“startupmanager“并安装。
使用办法：在菜单“系统－系统管理”里打开“启动管理器”并作相应设置。

把这些放在最前面就行了
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Microsoft Windows XP Professional
rootnoverify (hd0,0)
savedefault
makeactive
chainloader +1

两种方法都试过了，都是OK 的！

步骤是：1。在终端中输入命令：sudo gedit /boot/grub/menu.lst
2.这时会弹出menu.lst.
3.在表上修改你想要的内容。
如：想修改默认 的启动项 ，方法 1，和方法2都OK 的。