[Bug 1066324] Re: core.img too large for embedding with msdos partition style

[Julian Taylor]

my core.img is also larger than 32k and my not very old machine (partitioned about 1-2 years ago with gparted) also only had 64 start sectors until I had to fix it for quantal. So it may be a common issue.
as it can leave inexperienced users with an unbootable machine I'm marking it critical.

** Changed in: grub2 (Ubuntu)
   Importance: Undecided => Critical

** Changed in: grub2 (Ubuntu)
       Status: New => Confirmed

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Title:
  core.img too large for embedding with msdos partition style

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to 12.10 I found that I could no longer boot my
  system.  Instead I ended at a grub rescue prompt.  Attempting to fix
  this by booting from a USB stick built from the 12.04 alternative
  installer revealed that grub could no longer embed the necessary
  core.img file.  This same configuration worked flawlessly under 12.04,
  but no longer works under 12.10.  This would appear to be a
  regression.

  In order to get the system booting again, I had to move to a gpt
  partition table to allow for the larger core.img size.

  Relevant core.img creation command from attached grub-install debug
  output:

  /usr/bin/grub-mkimage -d /usr/lib/grub/i386-pc -O i386-pc
  --output=/boot/grub/i386-pc/core.img --prefix=(lvm/ssd-root)/boot/grub
  biosdisk ext2 part_gpt lvm

  Resultant core.img size:

  ls -l /boot/grub/i386-pc/core.img 
  -rw-r--r-- 1 root root 33257 Oct 13 08:45 /boot/grub/i386-pc/core.img

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: grub-pc 2.00-7ubuntu10
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu3
  Architecture: amd64
  Date: Sat Oct 13 08:41:42 2012
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: Upgraded to quantal on 2012-10-12 (0 days ago)

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