[Bug 1061255] Re: GRUB recognizes defunct LDM headers

[Phillip Susi]

It looks like the main copy of the LDM label is in sector 6, so perhaps
they also have that one.

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https://bugs.launchpad.net/bugs/1061255

Title:
  GRUB recognizes defunct LDM headers

Status in “grub2” package in Ubuntu:
  In Progress
Status in “grub2” source package in Quantal:
  In Progress

Bug description:
  [Impact]
  Grub can no longer boot Windows

  [Test Case]
  Use Windows to format a dynamic disk.  Use fdisk to repartition the disk as a regular MBR disk.  os-prober still recognizes the defunct ldm partition table with the Windows partition in it.

  [Regression Potential]
  Previously grub had no support for ldm, so the worst case is that it goes back to not recognizing ldm, as opposed to the goal of this patch of only recognizing *valid* ldm.
  .

  GRUB recognizes stale LDM headers left on the disk after reformatting
  without LDM.  This causes grub to complain either that embedding is
  not possible, and/or to incorrectly use the ldm partition module
  instead of msdos.

  - This bug affect GRUB2.00 (default bootloader of Ubuntu12.10).
  - This bug completely breaks access to any operating system, either when installing a fresh 12.10, or when upgrading from 12.04 to 12.10.

  ********************
  WORKAROUND1 (when GRUB appears, but the Windows entry fails and shows a "A disk Error Occurred" error):
  see Comment #44 below ( https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1061255/comments/44 )

  WORKAROUND2:
  see Comment #26 below ( https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1061255/comments/26 )

  WORKAROUND3:
  Use Boot-Repair ( https://help.ubuntu.com/community/Boot-Repair ) from liveCD to replace GRUB2 by GRUB Legacy: run Boot-Repair --> Advanced options --> GRUB options tab --> tick "GRUB Legacy" --> Apply

  ********************

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