安装双系统后，设置XP为开机默认启动

ubuntu安装后每次开机都是默认进入ubuntu系统的，我们可以修改为默认从windows启动：
打开终端，输入
sudo gedit /boot/grub/grub.cfg
menuentry这些表示启动选择项，将如下代码移到所有menuentry入口的最前面：
### BEGIN /etc/grub.d/30_os-prober ###
menuentry “Microsoft Windows (on /dev/sda1)” {
insmod part_msdos
insmod ntfs
set root=’(hd0,msdos1)’
search –no-floppy –fs-uuid –set 6EB00865B008365D
drivemap -s (hd0) ${root}
chainloader +1
}
### END /etc/grub.d/30_os-prober ###
再重启系统即可。
修改后部分代码如下：
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry “Microsoft Windows (on /dev/sda1)” {
insmod part_msdos
insmod ntfs
set root=’(hd0,msdos1)’
search –no-floppy –fs-uuid –set 6EB00865B008365D
drivemap -s (hd0) ${root}
chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/10_linux ###
menuentry ‘Ubuntu, with Linux 2.6.35-30-generic’ –class ubuntu –class gnu-linux –class gnu –class os {
recordfail
insmod part_msdos
insmod ext2
set root=’(hd0,msdos7)’
search –no-floppy –fs-uuid –set c11e8582-ef5e-4729