Ubuntu Linux, Windows XP 双系统重装Grub2

　　一般安装Linux, Windows双系统都是先安装Windows然后安装Linux，这种情况下Grub会自动检测到Windows并添加到启动列表中。如果安装顺序颠倒则可以有以下解决方法：

• 安装Grub4Dos  http://www.linuxidc.com/Linux/2009-01/18027.htm
  
• 使用Ubuntu LiveCD安装Grub到MBR

新版的Ubuntu使用的是Grub2，命令与Grub稍微有一些不同，大致操作如下

my-desktop:~$ sudo grub–setup –d /media/disk/boot/grub /dev/sda

其中disk和sda需要根据Linux所在硬盘进行调整。

以下是grub-setup的帮助信息

my-desktop:~$ sudo grub–setup  —help
Usage: grub–setup [OPTION]… DEVICE

Set up images to boot from DEVICE.
DEVICE must be a GRUB device (e.g. `(hd0,1)‘).

  -b, –boot-image=FILE   use FILE as the boot image [default=boot.img]
  -c, –core-image=FILE   use FILE as the core image [default=core.img]
  -d, –directory=DIR     use GRUB files in the directory DIR [default=/boot/grub]
  -m, –device-map=FILE   use FILE as the device map [default=/boot/grub/device.map]
  -r, –root-device=DEV   use DEV as the root device [default=guessed]
  -f, –force             install even if problems are detected
  -s, –skip-fs-probe     do not probe for filesystems in DEVICE
  -h, –help              display this message and exit
  -V, –version           print version information and exit
  -v, –verbose           print verbose messages

Report bugs to <bug-grub@gnu.org>.