grub-pc in gpt drive does not boot other drives

[oldfred]

Binary package hint: grub2

grub-pc installed on gpt drive sdb boots Ubuntu install on sdb but will not boot windows in sda or other Ubuntu installs in sdc.
Since I was booting directly from sdb I tried changing drive numbers 0,1, & 2 in set root with same results.

Windows boot error:
error: no such device 046.... (correct UUID for win on sda1 NTFS)
error: invalid signature

Ubuntu boot error for install on sdc5
error: not such device 1174... (corrrect UUID for Ubuntu on sdc5)
error: you need to load the kernel first

Same as above for sdc7 with correct UUID for sdc7 shown.

fred@fred-DTgpt:~$ apt-cache policy grub-pc
grub-pc:
  Installed: 1.98-1ubuntu6
  Candidate: 1.98-1ubuntu6
  Version table:
 *** 1.98-1ubuntu6 0
        500 http://ubuntu.mirrors.tds.net/pub/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     1.98-1ubuntu5 0
        500 http://ubuntu.mirrors.tds.net/pub/ubuntu/ lucid/main Packages

fred@fred-DTgpt:~$ uname -a
Linux fred-DTgpt 2.6.32-23-generic #37-Ubuntu SMP Fri Jun 11 08:03:28 UTC 2010 x86_64 GNU/Linux
fred@fred-DTgpt:~$ lsb_release -d
Description: Ubuntu 10.04 LTS

fred@fred-DTgpt:~$ sudo grub-install /dev/sdb
Installation finished. No error reported.
fred@fred-DTgpt:~$ sudo update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-2.6.32-23-generic
Found initrd image: /boot/initrd.img-2.6.32-23-generic
Found linux image: /boot/vmlinuz-2.6.32-22-generic
Found initrd image: /boot/initrd.img-2.6.32-22-generic
Found linux image: /boot/vmlinuz-2.6.32-21-generic
Found initrd image: /boot/initrd.img-2.6.32-21-generic
Found memtest86+ image: /boot/memtest86+.bin
Found Microsoft Windows XP Professional on /dev/sda1
Found Ubuntu 9.10 (9.10) on /dev/sdc5
Found Ubuntu 10.04 LTS (10.04) on /dev/sdc7
done

I was helping this user and he had the same issue. He converted drive to MBR and reinstalled.
http://ubuntuforums.org/showthread.php?t=1528910

[Colin Watson (cjwatson)]

I think this is a bug that was fixed upstream a couple of months ago,
and is now fixed in maverick. Could you try pressing 'c' to get the
GRUB command line, type 'insmod part_msdos', then press Escape and
select one of the menu entries that previously failed? If that works,
we can make it more permanent, but this test will do for now.

[oldfred (oldfred)]

I use c and at grub> prompt insmod part_msdos.

Both windows and Ubuntu then booted ok (a little slow it seemed in
switching to Ubuntu, windows is always slow so I could not tell any
difference.)

Glad you already had a fix. How would I have found this. I occasionally
review grub errors and other documentation.

Thanks,

Fred

[Colin Watson (cjwatson)]

Great, thanks for testing this. It would have been pretty difficult to find out for yourself without being quite familiar with GRUB development; filing a bug was the right thing to do.

To make this permanent, the simplest option for now is probably to edit /etc/grub.d/40_custom and add 'insmod part_msdos' at the very end of that file, after the comments.

[oldfred (oldfred)]

>
> To make this permanent, the simplest option for now is probably to edit
> /etc/grub.d/40_custom and add 'insmod part_msdos' at the very end of
> that file, after the comments.
>
I added insmod part_msdos to 40_custom & both windows on sda1 and Ubuntu
on sdc5 booted without any issues.

Thanks

Fred

[Rolf Leggewie (r0lf)]

lucid has seen the end of its life and is no longer receiving any updates. Marking the lucid task for this ticket as "Won't Fix".