Recover Grub of EFI System in Linux

Recover Grub of EFI System in Linux

  Sep 30, 2016    Sarad Gajurel    Reading time: 2 minutes

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:

    partitions

    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.

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ICT Solved! is created by Sarad Gajurel with an aim to solve your problems that arise in Linux, Windows, Android and iOS. Your feedbacks are welcomed.

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