** Description changed:
+ [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
********************
** Changed in: grub2 (Ubuntu Quantal)
Status: New => In Progress
** Changed in: grub2 (Ubuntu Quantal)
Assignee: (unassigned) => Phillip Susi (psusi)
** Changed in: grub2 (Ubuntu Quantal)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1061255
Title:
GRUB recognizes defunct LDM headers
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