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

EFI Non Bootable Ubuntu Fixing GRUB2

Hi! The 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…

1. How to Chrooting into a Non Bootable Ubuntu

   Chroot Non Bootable Ubuntu Guide

   Ubuntu Non Bootable Chroot

2. Searching for the EFI Partition.

   To List all Existing Partitions on System with respective Sizes:

   sudo apt-get install lvm2

   lvmdiskscan

   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

   Example:

   mount /dev/sda1 /boot/efi

4. Reinstalling GRUB 2.

   grub-install /dev/sd[X]

   Example:

   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.

   exit

   Possibly repeated Twice to Leave Chroot…

   sudo reboot

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