How to Repair Kali Linux grub after installing Windows in Dual boot System

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If your System has primary OS Windows then you install your secondary OS Kali Linux. That will be OK, Kali Linux puts boot entry of Windows automatically for you. At initial boot menu you can see both OS entry to boot.
If your windows is corrupt in dual boot system or if you want to install windows as secondary OS after installing Kali Linux as primary OS. You may face corrupt boot-loader menu. You wont be able to boot Kali Linux any more because Windows wont put entry of Kali Linux automatically in their boot menu.
So this post motive is to help those guys which are facing those problems subjecting to corrupt Boot-loader. There are mainly two methods:
1. Repair Grub via Kali Linux live USB.
2. Repair Grub Via Boot-rapair-disk.

Method 1# Repair Grub via Kali Linux live USB

It is up to you which you want to choose but if you are Linux familiar then go for this method.

Requirements

1. A Kali Linux ISO image. You can download here:
2. You need to create a Kali Linux pre-installed live CD or Live USB. You can click following link for more help to create live USB or CD-DVD.
How to create boot-able USB for Kali Linux.

Procedure to repair Grub of Kali Linux

1. Boot your live USB via pressing boot menu button on initial stage of booting your system. Select “Live” option.
2. Boot into Live Kali Linux, get the Terminal open. Type the following commands:
mount /dev/sda3 /mnt
mount –B /dev /mnt/dev
mount –B /dev/pts /mnt/dev/pts
mount –B /proc /mnt/proc
mount –B /sys /mnt/sys
chroot /mnt
grub-install /dev/sda
update-grub
exit
umount /mnt/dev/pts
umount /mnt/dev
umount /mnt/proc
umount /mnt/sys
umount /mnt

Step 3. Now reboot the system, you will see your boot-menu showing Window and Kali Linux both simultaneously.
Most of the time Kali Linux grub is repaired by above steps but exceptionally you may not, so you have to do more commanding.
Step 4. Boot the Live Kali Linux again, open the terminal type the following commands:

apt-get install os-prober
os-prober
update-grub

This will help a lot to repair Kali Linux Grub.

Method 2# Repair Grub Via Boot-rapair-disk

It is up to you which you want to choose but if you are not Linux familiar then go for this method.

Requirements

1. A Boot-repair-disk ISO image. You can download here:
2. You need to create a Boot-repair-disk pre-installed in live CD or Live USB.

Procedure to repair Kali Linux Grub

Boot into Live USB by pressing boot-button at initial stage of booting the system.
After that, it is all automated. As soon as you boot into this live disk, it will automatically begin mounting all your file systems and looking for grub. Once it is located, it will be restored automatically and at the end a message will be displayed to you.

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