restore Grub 2 after reinstalling Windows XP/Vista/Win7

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Question:  How  to restore Grub 2 after reinstalling Windows XP/Vista/Win7 ?

Answer: There is  two  ways  to  restore the grub2 on MBR  after  reinstalling  windows

• Methode1

 Use the following commands:

grub>find /boot/grub/core.img

grub>root (hdx,y) (previous command will output the x,y)

grub>kernel /boot/grub/core.img

grub>boot

After the boot command,you’ll go into grub2 menu. Select to boot up ubuntu, and run this command to restore grub.

sudo grub-install /dev/sda

•  Mothode2

You need to have an Ubuntu LiveCD, Start with LiveCD

under root, check your Linux partition

fdisk -l

example output for Linux partition7

/dev/sda7 7300 7919 8880278+ 83 Linux

 sudo mkdir mnt1

sudo mount /dev/sda7 mnt1

followed by:

sudo grub-install --root-directory=/mnt/ /dev/sda

Where is your root directory mounted? Is it /mnt? That’s not where you mounted it just now…

sudo grub-install --root-directory=/media/mnt1 /dev/sda

•  Methode3

It’s possible to do grub2/burg recovery & configuration using a live cd by installing  Grub Customizer  at the live system.  All the file systems you need will be automatically mounted after choosing the root partition and some sub partitions on the “live cd setup assistant” (a dialog which pops up, when you start Grub Customizer inside a live system).*

You can install Grub customizer using the following PPA:

sudo add-apt-repository ppa:danielrichter2007/grub-customizer

sudo apt-get update

sudo apt-get install grub-customizer

Related posts:

1. Grub Customizer – A graphical grub2 settings manager
2. Grub Customizer 2.0 released
3. How to reinstall Grub in linux
4. Fixing a few common grub errors | Broken Bootloader and error 17/15
5. Save and Restore MBR in Linux