Grub does not access /boot/grub under fakeraid

[Thomas Schiex]

After the last update of grub-pc under oneiric beta, I could not reboot and fell under grub rescue mode.
The only accessible disc under grub rescue 'ls' was (hd0), claimed to be of 'unknown filesystem'. A reboot under a natty
rescue disc shows that all disk partitions are fine and SATA raid partitions can be mounted. After a chroot,
update-grub did not help. addind raid and mdraid09 in the PRELOAD modules did not either.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Liny (liny)]

The problem still exists in the official release of Ubuntu 11.10.

[Liny (liny)]

I find this workaround works for me.

Reinstall GRUB with

sudo grub-install --module="part_msdos" --root-directory=(your_mount) (your_dev_file)

It's able to reboot now.

To make it easier for later kernel updates, just put part_msdos into grub-install line "modules="

[Thomas Schiex (thomas-schiex)]

This bug is still there... in Precise Pangolin and in the beta1 of Quantal Quetzal.

[Phillip Susi (psusi)]

Can you post the results of the following command:

sudo grub-probe -t partmap /

Also could you download and run this script and post the results:

http://sourceforge.net/projects/bootinfoscript/

[Thomas Schiex (thomas-schiex)]

Yes, of course. Here is the output of

> sudo grub-probe -t partmap /
gpt

And the results of running bootinfoscript are attached below.

Please note the the workaround of Liny works fine, adding the part_msdos module does save me (despite the expected gpt partition table - I'm running on en EFI/MAcOS/Linux system).

Thanks for your work.

Kind regards
Thomas

[Phillip Susi (psusi)]

I'm confused beacuse you mentioned raid before, but you appear to only have a single disk setup with no raid. Have this changed since you originally reported the bug?

[Thomas Schiex (thomas-schiex)]

Le vendredi 05 octobre 2012 à 17:41 +0000, Phillip Susi a écrit :
> I'm confused beacuse you mentioned raid before, but you appear to only
> have a single disk setup with no raid. Have this changed since you
> originally reported the bug?

Sorry Phillip,

I apparently was to eager to answer you immediately and I did not excute
your test on the correct machine apparently. I'm currently away from
home for one week. I'll check back on the RAID machine ASAP.

Thomas

[Thomas Schiex (thomas-schiex)]

Back home...

> sudo grub-probe -t partmap /
msdos

And the results of running bootinfoscript are attached below.
Please note the the workaround of Liny works fine, adding the part_msdos module does save me (and this raid machine is BIOS, not EFI).

Thanks for your work.

Kind regards
Thomas

[Phillip Susi (psusi)]

And when you run grub-install, which device do you point it to?

[Launchpad Janitor (janitor)]

[Expired for grub2 (Ubuntu) because there has been no activity for 60 days.]