All the linux users who use distro with GRUB as a bootloader are aware of its value. That hard time when you power on the computer and after a brand logo the next screen just appears to show you message that GRUB was not able to load the entries. In this article, you’ll get to know how to recover the GRUB bootloader on EFI/UEFI system.

NOTE: This article shows the method of recovering the GRUB only for Debian and it’s derrivatives that uses ‘apt-get’ as package manager with EFI/UEFI systems. If your bootsector uses MBR this does not work at all.

Pre-requisite: Live bootable media of your Linux distro and an working internet connection

Steps:

1. Boot your Linux distro live

2. open the terminal

3. Find out Linux partition and EFI partition with following command:

    sudo fdisk -l
   

   You will see the output similar to image below:

   

   Look at the ‘Device’ and ‘Type’ column. In my case,

    /dev/sda2 is EFI System
   
    /dev/sda7 is Linux filesystem
   

   Note out your EFI System and Linux filesystem Device.

4. Now you need to execute the following commands replacing with your ‘Device’ accordingly:

    sudo mount /dev/sda7 /mnt
   
    sudo mount /dev/sda2 /mnt/boot/efi
   
    sudo for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
   
    sudo cp /etc/resolv.conf /mnt/etc/
   
    sudo modprobe efivars
   
    sudo chroot /mnt
   
    sudo apt-get update
   
    sudo apt-get install --reinstall grub-efi-amd64
   
    sudo update-grub
   
    sudo umount /mnt/boot/efi
   
    sudo umount /mnt
   
    exit
   
    sudo reboot
   

5. Now you are done and the grub menu should appear on reboot.

NOTE: If you have dual boot, another OS may not be listed in the entry so after reboot open the terminal and enter following command:

	sudo update-grub

That’s all and you are good to go. Let me know through comments if you face any problem and I’ll be there for you.