How to repair GRUB boot loader in ubuntu

In this tutorial we will see how to use this GUI tool called boot-repair which fixes most of the common grub related problems.

The most common problem is the overwriting of the GRUB bootloader by the windows bootloader when windows is installed after ubuntu. or overwrite your MBR. And also if your GRUB has broken you won’t be able to access your operating systems.

Make sure you boot from a bootable pendrive/CD to before using this tool.

In order to install this tool first add this repository to your software sources

sudo add-apt-repository ppa:yannubuntu/boot-repair

press enter when asked

and then update sources

sudo apt-get update

finally install it

sudo apt-get install boot-repair

now launch the tool by typing


click on recommended repair

you can click on Advanced options and customize grub as you want

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