How to install the Boot-Repair tool in an Ubuntu live disc?

Question

When the bootloader (GRUB) is broken, I cannot access neither Ubuntu nor Windows.

I heard that an easy solution to fix this is to use the Boot-Repair tool from an Ubuntu liveCD (or liveUSB).

What are the steps to do this?

Answer 1

1. Insert the Ubuntu disc, or connect the Ubuntu liveUSB.
2. Setup the BIOS to make it boot on the Ubuntu disc
3. Reboot the PC
4. When asked, choose Try Ubuntu
5. Connect internet
6. Open a terminal, and type (or copy-paste) the following command:

sudo add-apt-repository -y ppa:yannubuntu/boot-repair && sudo apt-get update

Press Enter, then type the following command:

sudo apt-get install -y boot-repair && boot-repair

Press Enter. That's it, the Boot-Repair window will appear!