After Windows XP is reinstalled on both systems, repair GRUB to retrieve the Ubuntu boot menu.

After Windows XP is reinstalled on both systems, the mbr is written by XP, causing grub to be unable to work. The solution is to start from the CD-ROM and start from UbuntuLiveCD to the desktop. Click "application"-& gt; "attachment"-& gt; "terminal" input: sudogrub input: find/boot/grub/stage1 shows the actual operation results: (hd0, 4)

After Windows XP is reinstalled on both systems, grub cannot work due to information written by Windows XP.

Start from the CD-ROM and start from Ubuntu Live CD to the desktop.

On the task bar, choose Application> attachment> terminal 』

Input: sudo grub

Input: find/boot/grub/stage1The actual operation result is shown in (hd0, 4)

Input: root (hd0, x)# Input the data fed back by the find command. For example, enter 4

Input: setup (hd0)The result shown in the preceding figure is displayed.

Input: quit# Exit grub.

If it doesn't happen again, congratulations! You can see the dual-system boot for Windows XP and Ubuntu.