Recover GRUB after Windows Installation

Often we lose GRUB boot loader whenever we install Windows after Linux installation. This is a terrible hazard to all who love to use dual, triple or even quadrapole or even higher boot systems on their Lappys or Desktop PCs. Here’s the fix

Step 1. Boot with your Ubuntu Live CD or DVD
Step 2. Open gnome-terminal or konsole
Step 3.

$ sudo grub

You’ll get a” grub>” prompt.

Step 4.

grub>find /boot/grub/stage1

You’ll have an output like (hd0,0) ,  it’ll be the number of your partition.

For hda1,sda1 it’ll be (hd0,0),

For hda2,sda2 it’ll be (hd0,1),

For hdb1,sdb1 it’ll be (hd1,0).

Step 5.

grub>root (hd0,1)

Step 6.

grub>setup (hd0)

Step 7.

grub>quit

Step 8.

Reboot the machine.

The boot loader should be recovered now .
Another way to fix is to enter into the single user mode at the time of boot from the selection menu & when you have the root prompt do the following:

# grub

You’ll have “grub>” prompt like before.

Now repeat from Step 4 to Step 8 as before and you’re done

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