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I have a system which has triple booted Windows 10, Ubuntu 16.04 and Kali Linux. I installed them in that order, so right now when I turn on the computer the GRUB from Kali Linux is what loads.

I want to uninstall Kali Linux which is the easy part. I'll just delete the partition which has Kali and it's done. But how do I restore the GRUB of Ubuntu so that I can boot Ubuntu or Windows from the bootloader menu?

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You can use a tool called Boot-Repair to easily re-install GRUB.

Boot a live session, connect to the internet, and then put this in your Terminal:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt update
sudo apt install -y boot-repair
boot-repair
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  • Worked perfectly! Tks!
    – Caio Mar
    Feb 22 '19 at 2:07
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just login to your linux box(ubuntu 16.04 in your case) and run sudo update-grub . this will automatically detect the OS install on ur system.

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    This will not help, you would have to install Grub from Ubuntu with sudo grub-install /dev/sdX before you delete the Kali-partition. If you delete the Kali-partition first you can't boot to Ubuntu anymore, then the answer of @Aaron Franke will be a possibility to reinstall Grub.
    – mook765
    Mar 17 '17 at 9:00

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