Repair boot XP, Win7, Ubuntu after dual system reinstallation

This article is for a single hard disk host, divided into three steps.

The first step:

Using LiveCD or a U-disk to boot your computer into Ubuntu, it's best to make sure the system versions are the same.

Menu System-Administration->disk Utility See the Ubuntu root partition number, such as/dev/sda6.

"If the boot partition is hung independently, remember the partition number of the boot partition"

Using the shortcut key ctrl+alt+t to bring up the terminal,

Execute command:

Sudo-i

Mount/dev/sda6/mnt

Write down the result of the following command:

Uname-r

Execute command:

Grub-install--ROOT-DIRECTORY=/MNT/DEV/SDA

Restart your computer.

Step Two:

If the system is ubuntu9.10, a black screen shell input interface may appear after the system restarts:

Sh:grub>

At this point, perform the following command to view the partition, and the partition number where the boot is located:

Ls-l

Based on the results, the execution

Sh:grub> Root (hd0, 6)

Note: The above 6 is based on the specific situation to be seen.

Then execute:

Sh:grub> Linux/boot/vmlinuz-2.6.35-22-generic Root=/dev/sda6

Note: Here 2.6.35-22-generic is the execution result of the uname-r mentioned above.

Then execute:

Sh:grub> Initrd/boot/inttrd.img-2.6.35-22-generic

Execute the following command to enter the system:

sh:grub> Boot

If the system is ubuntu-10.10, the boot menu of the previous reload system can be seen at this time of reboot.

Select Ubuntu System to boot.

Step Three:

Using the shortcut key ctrl+alt+t to bring up the terminal,

Execute command:

sudo update-grub2

If it is a ubunt-9.10 system, then continue with the following instruction:

sudo grub-install/dev/sda

To this, the repair is complete.

[email protected]:~$ sudo update-grub[sudo] password for jason:generating grub.cfg ... Found Linux Image:/boot/vmlinuz-2.6.35-22-genericfound initrd Image:/boot/initrd.img-2.6.35-22-genericfound memtest86+ Image:/boot/memtest86+.binfound Windows 7 (loader) On/dev/sda1done

Repair boot XP, Win7, Ubuntu after dual system reinstallation