[Bug 1020045] Re: "grub-install" inserts wrong UUID when 2 disks

[Phillip Susi]

Ahh, you are correct.

The part that you forgot to do was to run update-grub, which generates
grub.cfg and populates it with the correct UUID.

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Title:
  "grub-install" inserts  wrong UUID when 2 disks

Status in “grub2” package in Ubuntu:
  Invalid

Bug description:
  
  Distributor ID: Ubuntu
  Description:     Ubuntu 12.04 LTS
  Release: 	   12.04
  Codename:       precise
  Kernel:              3.2.0-23-generic-pae
  Bit width:         32 bits


  An example explains best what happens.

  Backgroud:
  =========

  A disk was replaced with a bigger one.  Partition copied from original disk to new one using Gparted.  UUID replaced on new disk and fstab updated.  Boot flag set on for the new disk.   New disk will be "sda" and old one "sdb" i.e. both disks available at the same time.
   
  Grub installation:
  =============

  sudo blkid

  /dev/sda1: UUID="9a2e67e5-0583-4901-a523-61a8c75f4296" TYPE="ext4" 
  /dev/sda5: UUID="16e86b9b-0f88-4dcf-89f8-d3413f9b79a9" TYPE="ext4" 
  /dev/sda6: UUID="24d4a0ec-c204-42e3-8bb8-cafc99b7d619" TYPE="swap" 

  /dev/sdb1: UUID="06a2d171-44f3-4898-8bba-cd639070d2c3" TYPE="ext4" 
  /dev/sdb5: UUID="168b97ba-49e7-4923-afe6-f7c72539978e" TYPE="swap" 

  sudo mount /dev/sda1 /mnt

  sudo grub-install --boot-directory=/mnt/boot  /dev/sda

  Result:
  =====

  Boot from "sda" fails since  grub still using UUID of old disk "sdb1"
  although new disk "sda1" was specified above.

  
  Work around (failed, too)
  ====================

  Grub allows you to specify UUID instead of /dev/....

  sudo grub-install --boot-
  directory=UUID=9a2e67e5-0583-4901-a523-61a8c75f4296   /dev/sda

  Unfortunately that failed, too.  Boot resulted in a prompt:

  grub>

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