Ubuntu 9.10使用了grub2(不确定是不是2)，与以往不同新版本的grub的引导配置文件不再是menu.lst而是
/boot/grub/grub.cfg ，这个文件默认是只读的，因此在修改之前需要先将其改为可写
sudo chmod +w /boot/grub/grub.cfg
然后就可以修改了。给其中加上如下内容即可
sudo gedit /boot/grub/grub.cfg
添加后内容如下：
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/grub-mkconfig using templates
# from and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
set default=0
set timeout=5
set root=(hd0,7)
search --fs-uuid --set 28d5eac5-c42c-49ef-8537-0b280ff87de1
if loadfont /usr/share/grub/ascii.pf2 ; then
set gfxmode=640x480
insmod gfxterm
insmod vbe
if terminal_output gfxterm ; then true ; else
# For backward compatibility with versions of terminal.mod that don't
# understand terminal_output
terminal gfxterm
fi
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
menuentry "Ubuntu, linux 2.6.30-8-generic" {
set root=(hd0,7)
search --fs-uuid --set 28d5eac5-c42c-49ef-8537-0b280ff87de1
linux /boot/vmlinuz-2.6.30-8-generic root=UUID=28d5eac5-c42c-49ef-8537-0b280ff87de1 ro quiet splash
initrd /boot/initrd.img-2.6.30-8-generic
}
menuentry "Ubuntu, linux 2.6.30-8-generic (recovery mode)" {
set root=(hd0,7)
search --fs-uuid --set 28d5eac5-c42c-49ef-8537-0b280ff87de1
linux /boot/vmlinuz-2.6.30-8-generic root=UUID=28d5eac5-c42c-49ef-8537-0b280ff87de1 ro single
initrd /boot/initrd.img-2.6.30-8-generic
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
linux /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
linux /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###
menuentry "Windows XP Pro" {
set root=(hd0,1)
chainloader +1
}
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file is an example on how to add custom entries
### END /etc/grub.d/40_custom ###