[Bug 1072880] Re: grub fails to install on dmraid during upgrade to 12.10

[Paul Boven]

Hi Philip,

On 10/30/2012 09:22 PM, Phillip Susi wrote:
> Can you run sudo dpkg-reconfigure grub-pc and verify that
> /dev/mapper/isw_isw_cbfbcabehj_Volume0 is selected as the location to
> install to, and that you get no errors?

When I run sudo dpkg-reconfigure grub-pc, I get:

"Configuring grub-pc. The grub-pc package is being ugpraded, this menu 
allows you to select which devices (etc.)"

It then provides a list of devices: /dev/sda, /dev/sdb (the hard drives 
themselves), /dev/mapper/isw_cbfbcabehj_Volume0 (the raid device for the 
full disk) and /dev/dm-1 (the mirrored root partition). None of these is 
highlighted. I can select the /dev/mapper/isw_(...)_Volume0, and then 
dpkg-reconfigure ends with "Installation finished. No error reported. 
Generating grub.cfg..." (and concludes with all the Linux kernel images 
it found).

Regards, Paul Boven.

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https://bugs.launchpad.net/bugs/1072880

Title:
  grub fails to install on dmraid during upgrade to 12.10

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  During the upgrade from 12.04LTS to 12.10, grub reported the following
  errors:

  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.2.0-30-generic /boot/vmlinuz-3.2.0-30-generic
  generating grub.cfg
  /usr/sbin/grub-probe: error: cannot find a GRUB driv for /dev/mapper/isw_cbfbcabehj_Volume0p1. Check your device.map.
  (repeated 34 more times).

  And a big popup:
  "GRUB failed to install to the following devices:
  /dev/dm-0
  Do you want to continue anyway? If you do your computer may not start up properly.
  Writing GRUB to boot device failed - continue? "
  (I decided to continue, as the system already had a working grub, and there seemed no way out of the situation anyway)

  After reboot, the system is stuck in "grub rescue" and is currently
  unbootable.

  When booting from a rescue-USB, I can activate the fakeraid (Intel Matrix raid) with 'dmraid -ay' and can mount the root
  partition, but I am unable to put grub on it:
  grub-installer fails (cannot find device for /, /boot - grub installer clobbers much of its own output)
  /mnt/usr/sbin/grub-install fails (Cannot open /usr/share/grub/grub-mkconfig_lib)
  chroot /mnt grub-install fails (Path /boot/grub is not readable by GRUB on boot. Installation is impossible. Aborting)

  The system was originally installed, brand new, with 12.04 LTS (no
  other OS on it). DMraid was configured through the regular installer,
  I don't recall any grub issues back then.

  I'm happy to provide any additional information that's needed, but
  this might be difficult due to the system not being bootable.

  While running a chroot on /mnt (the dmraid-device with my original
  root filesystem) I get:

  lsb_release -rd: Description: Ubuntu 12.10, Release: 12.10

  apt-cache policy grub2-common:
  Installed: 2.00-7ubuntu11, Candidate: 2.00-7ubuntu11

  Recovery CD has kernel 3.2.0-32, target system has 3.5.0-32 on it but
  does not boot into that.

  Expected: a clean upgrade to 12.10 and being able to use the system
  again.

  What happened instead: system is currently unbootable, hangs in "grub
  rescue", though no dataloss seems to have happened. I cannot even boot
  into an older kernel.

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