sudo nano /boot/grub/menu.lst
然后会弹出一个框：
引用:# 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
在选择系统时，有几个选择，注意顺序是0开始，0,1,2,3,4
若你的Xp是排在第四，即“default 0“改为”default 3“.
而timeout是调节多少秒自动进入默认系统
改完后，保存（ctrl o),然后退出（ctrl x).