It appears that this was fixed in trusty, and quantal is now end of
life.
** Changed in: grub2 (Ubuntu Quantal)
Status: In Progress = Won't Fix
** Changed in: grub2 (Ubuntu)
Status: In Progress = Fix Released
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Has this bug been fixed? It has been on critical for ~1.5 years and
nobody seems to care about it anymore.
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Title:
GRUB recognizes defunct LDM
same here
dd if=/dev/zero of=/dev/sda bs=512 seek=6 count=1
You can screw up all your disk or primary partition, check lot of times
if you are right.
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I had the same problem in Debian with the following package version:
Package: grub2
Version: 2.00-14
and WORKAROUND2 did work.
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Title:
GRUB
that actually IS a dynamic disk
ok, so let's forget my post #67
the seek argument should be 6, not 5.
ok, thanks. i'll come back to you when i get new results.
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@Phillip: here is an example where
1) zeroing the last sector didn't workaround this bug (lines 658 / 659)
2) sector 6 does not contain PRIVHEAD (see line 624)
http://paste.ubuntu.com/1472348/
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According to the MBR that actually IS a dynamic disk, and and the seek
argument should be 6, not 5.
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Title:
GRUB recognizes defunct LDM headers
I can confirm that in my case sector 6 also contained the stray PRIVHEAD stuff.
Zeroing this sector (only the first byte of it, in fact) in addition to
zeroing the last sector fixed the problem for me.
Now grub2 no longer treats the disk as LDM.
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Just to be sure: when you say sector 6, do you mean the 6th sector, eg
dd if=/dev/zero of=/dev/sda bs=512 seek=5 count=1 ?
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Title:
GRUB
Here is another one where zeroing the last sector didn't help:
http://paste.ubuntu.com/1461860
(I don't know LDM much, so I don't know if you need more examples like
this or not, just tell me)
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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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Title:
GRUB recognizes defunct LDM headers
To
The last three may be related to this instead:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1088796.
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Title:
GRUB recognizes defunct LDM
Another case where zeroing the last sector didn't help:
http://paste.ubuntu.com/1456865/
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Title:
GRUB recognizes defunct LDM headers
To manage
@phillip: here is a case where zeroing the last sector does not fix the
bug: http://paste.ubuntu.com/1452326
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Title:
GRUB recognizes defunct LDM
@Phillip: here is a case where the last sector does not contain
PRIVHEAD : http://paste.ubuntu.com/1420216
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Title:
GRUB recognizes defunct LDM
12.04 did not support ldm and your disk is a hybrid, still having a
regular msdos partition with the SFS type mapping to your windows
partition, thus msdos also works. If the unmodified ldm configuration
does not work, please file a new bug report.
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I zapped last sector, but anyway tried patch. I ran:
sudo apt-add-repository ppa:psusi/ppa
sudo apt-get update
sudo apt-get upgrade
sudo update-grub
Not fixed here - I got ldm again in grub.cfg :( Manually fixed this to
msdos in Kate.
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Can you post the output of sudo fdisk -lu and apt-cache policy grub-pc?
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Title:
GRUB recognizes defunct LDM headers
To manage notifications
Ahh, unless you are running raring, then you didn't get the update. I
have copied it to the quantal pocket so try the update upgrade again.
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I got the update by fidgeting with the sources, so 2.00-7-ubuntu14 was
installed when I posted above.
fdisk -lu output http://paste.ubuntu.com/1417526/
apt-cache output (I changed the repository back , just to see if it made
a difference. It didn't) http://paste.ubuntu.com/1417528/
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Is your windows on the 750 gb drive or the 16gb drive?
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Title:
GRUB recognizes defunct LDM headers
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It's on the 750gb (/dev/sdb) - the 16gig is a cf-card
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Title:
GRUB recognizes defunct LDM headers
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Then it is *supposed* to be using ldm since that is a dynamic disk.
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Title:
GRUB recognizes defunct LDM headers
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Thanks Phillip - looks like I did not get update. Now it is fixed for me
:D
Everytime I run sudo update-grub I got msdos now and everything works
flawlessly :D
You are the best! Thanks! :D
Just for confirmation fdisk -lu apt-cache results (after successful
update):
Then the ldm-loader is broken, because this is the configuration that
boots into win7 on the second disk, with the part generated by grub
commented out http://paste.ubuntu.com/1404094/.
I'll downgrade to 12.04 and see what grub.cfg looks like.
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I've reinstalled 12.04, out of curiosity.
Grub:
sudo apt-cache policy grub-pc
grub-pc:
Installed: 1.99-21ubuntu3
Candidate: 1.99-21ubuntu3
Version table:
*** 1.99-21ubuntu3 0
500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
100 /var/lib/dpkg/status
And the
** 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
I finally got it booting into Windows, but I had to edit grub.cfg to get
it booting.
I tried zeroing the last sector (it did indeed have an LDM header) but
no luck.
Edited grub.cfg http://paste.ubuntu.com/1404094/
Parted print http://paste.ubuntu.com/1404097/
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I guess this is the same bug preventing me from booting into Windows,
even if it is on a seperate disk.
I upgraded Grub from Phillip's PPA, without much luck.
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** Branch linked: lp:~psusi/ubuntu/quantal/grub2/fix-ldm
** Branch linked: lp:~psusi/ubuntu/raring/grub2/fix-ldm
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Title:
GRUB recognizes
** Changed in: grub2 (Ubuntu Quantal)
Milestone: None = quantal-updates
** Changed in: grub2 (Ubuntu)
Milestone: quantal-updates = None
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Another case:
http://ubuntuforums.org/showthread.php?p=12377454#post12377454
** Description changed:
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
As I said before, make sure you see the PRIVHEADER before doing the
second dd command, and if you do then this should fix the problem.
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Title:
I do not like suggesting dd to new users.
In this thread just adding a Windows 7 boot stanza to 40_custom worked.
Grub legacy almost never found Windows 7 either and we almost always had
to add the boot stanza for Windows 7 to menu.lst.
http://ubuntuforums.org/showthread.php?t=2088596
See post
If you haven't zapped the last sector yet, I am building a patched
version that should fix the bug and could use testing. Please add my
ppa and update:
sudo apt-add-repository ppa:psusi/ppa
sudo apt-get update
sudo apt-get upgrade
** Changed in: grub2 (Ubuntu)
Assignee: (unassigned) =
** Also affects: grub2 (Ubuntu Quantal)
Importance: Undecided
Status: New
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Title:
GRUB recognizes defunct LDM headers
To manage
** Description changed:
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
Here's my boot-repair url :
http://paste.ubuntu.com/1390468/
I keep having trouble launching Windows 7 from the grub. I get the A disk
Error Occurred. Press ctrl alt del to restart.
The ubuntu team said it was this bug, Can anyone confirm? Do i need to recover
windows 7 boot first before
Should i use the workaround with boot-repair?
WORKAROUND:
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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Yes, this bug is affecting you. You can zap the last sector of the disk
and run update-grub and that should fix it.
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Title:
GRUB recognizes
Sorry Phillip can you elaborate a bit more, i'm a bit newbie on ubuntu,
so how do i zap the last sector of the disk?And do i do it on a liveCD
run?
regards,
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Do i need to recover the windows 7 boot first and then run liveCD ?Do i
do what you said here:
It is actually the backup copy at the end of the disk that appears to be the
problem. Zeroing out the last sector of the disk should fix it. To do this, you
want to follow steps similar to this:
You don't have to do it from a livecd, and yes, after that you can just
run sudo update-grub and it should work properly.
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Title:
GRUB
Here's the initial command:
maxrunner@RossaPc:~$ sudo fdisk -lu /dev/sda
[sudo] password for maxrunner:
Disk /dev/sda: 1000.2 GB, 1000203804160 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953523055 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical):
So making these two commands:
sudo dd if=/dev/sda bs=512 count=1 skip=1953523054 | hd
and
sudo dd if=/dev/zero of=/dev/sda bs=512 seek=1953523054 count=1
Will not trash my disk? im a little hesitant lol.
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Hi all,
same here :
http://paste.ubuntu.com/1356497/
Worked with Philip's zeroing of last sector. Many thanks.
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Title:
GRUB recognizes
I had the same problem and after having searched for a while I have solved with
solution proposed by Phillip!
Thank you Phillip!
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Title:
GRUB
Can 'grub-install --force /dev/sdX...' be used as a workaround? has
anyone tried?
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Title:
GRUB recognizes defunct LDM headers
To manage
No, since grub also uses the wrong partition module and references the
wrong partition when trying to locate windows, if it even sees it at all
to add an entry to the menu.
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** Changed in: grub2 (Ubuntu)
Milestone: None = ubuntu-12.04.2
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Title:
GRUB recognizes defunct LDM headers
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I have exactly the same problem and solution proposed by Phillip works
for me, so thanks you Phillip.
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Title:
GRUB recognizes defunct LDM
Seeing as how parted does not support LDM so we can't properly partition
such disks anyhow, I suggest that we disable the ldm support in grub for
now.
** Changed in: grub2 (Ubuntu)
Milestone: ubuntu-12.04.2 = quantal-updates
** Tags added: regression-release
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Filling last sector of HDD with zeros did not help me. There was a
PRIVHEAD string at beginning of sector, it is now deleted, checked few
times, to be sure, but after sudo update-grub I still got insmod ldm.
Hope that this did not trashed my disk :P
Until this will be fixed I also suggest to
It is actually the backup copy at the end of the disk that appears to be
the problem. Zeroing out the last sector of the disk should fix it. To
do this, you want to follow steps similar to this:
sudo fdisk -lu /dev/sda
Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track,
Another case: http://paste.ubuntu.com/1308936
** Description changed:
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
How safe would it be to save the partition layout (eg sfdisk), zero the start
of the disk, reapply the partition layout, and grub-install?
At least for simple cases, where no additional volume management is being used?
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Critical? Damn, this is Blocker! I almost lost all my data on hard drive
(but with testdisk restored it) when tried to solving problem with
GRUB before I let to know that is bug! :(
p.s. Sorry for my English.
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Another user: http://paste.ubuntu.com/1301238
GRUB2.00 can't install into the MBR because of this bug. Is there any
workaround? (like adding --force , --disk-module=... , --module=... , or else?)
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Again: http://ubuntuforums.org/showthread.php?p=12313102#post12313102
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Title:
GRUB recognizes defunct LDM headers
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Another case: http://paste.ubuntu.com/1298601/
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Title:
GRUB recognizes defunct LDM headers
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Another case: http://paste.ubuntu.com/1284827/
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Title:
GRUB recognizes defunct LDM headers
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This bug affects me too:
/usr/sbin/grub-bios-setup: warning: this GPT partition label contains no BIOS
Boot Partition; embedding won't be possible.
/usr/sbin/grub-bios-setup: error: embedding is not possible, but this is
required for RAID and LVM install.
In the past this drive was formatted as
** Description changed:
- This happened after an update to grub using Ubuntu 12.10, all the sudden
- one day after updating windows 7 would not boot, i noticed that GRUB has
- now added LDM parameters to the Windows 7 loader in GRUB. Windows 7 is
- in fact NOT installed on LDM.
+ GRUB recognizes
Got exactly the same bug here, attached grub.cfg
Results of parted print
(parted) print
Model: ATA SAMSUNG HD103SJ (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End
Attached: results of sudo grub-probe -t partmap -d /dev/sda1 -v (without
-v switch I got just empty line)
** Attachment added: Results of sudo grub-probe -t partmap -d /dev/sda1 -v
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1061255/+attachment/3400844/+files/grub-probe.txt
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is there a way to disable grub rescanning after every package update?
its getting really annoying editing grub.cfg all the time with grub
having daily updates being pushed out
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LDM is default installation type since I believe windows xp pro, it's
just probably headers were not cleared when deactivating it leading to
interesting behaviour.
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its just weird. i got this pc brand new, in march, installed 7,ubuntu
and backtrack, neither logical, and havent messed with partitions
since.
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It IS recognizing LDM on the disk. My guess is that the LDM headers are
still present from when they were used before, so grub is recognizing
them. The fact that the dos partition table does not show an LDM
partition however, should bar the detection of LDM I think.
** Summary changed:
- GRUB
certainly is weird. ive NEVER had windows on ldm, and furthermore,
nothing in the system has changed in over a year. all the sudden after a
grub update a few weeks ago, this started happened, i only noticed cuz i
went to boot into win7 and i got a diskread error, which made me check
grub.cfg. i
it IS a PITA that i have to manually edit grub.cfg everytime theres an
update. this system has been running perfectly for months. they changed
SOMETHING in one of the last 5-10 updates that is making it see an ldm.
i think it was the update that chaged the layout of the grub menu. IE my
menu used
LDM support is a recently added feature in grub, so that would explain
why it didn't do this before. You probably did use LDM on the drive at
some point in the past, but have long ago reformatted. I'm looking into
the LDM format now.
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