How-to Reinstall Grub 2 on a Non Bootable EFI Ubuntu 15.04-14.10-14.04 GNU/Linux Easy Guide

April 20th, 2015 by thelinuxevangelist

EFI Non Bootable Ubuntu Fixing Grub2

The Linux Tutorial Shows You Step-by-Step How Try to Fix/Reinstall/Recover the Grub 2 Bootloader on a EFI Non Bootable Ubuntu 15.04-Vivid/14.10-Utopic/14.04-Trusty i386/amd64 GNU+Linux System.

The Ubuntu Installation on EFI Systems dispose of a little EFI First Partition (normally about 200Mb) that is Needed to Manage on Grub 2 Proper Re-installation…

Fix/Recover EFI Ubuntu Grub 2 Bootloader - Featured
  1. How-to Chrooting into a Non Bootable Ubuntu:

    Chroot Non Bootable Ubuntu Guide
  2. Searching for the EFI Partition

    To List all Existing Partitions on System with respective Sizes:

    sudo apt-get install lvm2

    You should Find a First Partition of about 200Mb on a /dev/sd[X]1 Device!

  3. Mounting the EFI Partition

    On the Chrooted System!

    sudo su
    mount /dev/sd[X]1 /boot/efi


    mount /dev/sda1 /boot/efi
  4. Reinstalling Grub 2

    grub-install /dev/sd[X]


    grub-install /dev/sda

    The Installation should be Achieved without Errors…

  5. Find the EFI Partition UUID

    ls -l /dev/disk/by-uuid

    Copy the UUID of the EFI Partition from the Output.

  6. SetUp EFI to be Mounted during StartUp

    nano /etc/fstab

    Append something like:

    UUID=[myP4rt-UUID]  /boot/efi       vfat    defaults        0       1

    Substitute Your Partition UUID Value to [myP4rt-UUID]!
    Ctrl+x to Save & Exit from nano Editor ;)

  7. Rebooting


    Eventually repeated Twice to Leave Chroot…

    sudo reboot now

    Now Cross the Fingers and Hope to have Relived Your Marvelous Ubuntu Linux! :)

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