[Bug 1068137] Re: grub2: Some modules may be missing from core image..

[zoolook]

Update to this problem.

This bug kicks in when /boot is a separated partition from /

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Title:
  grub2: Some modules may be missing from core image..

Status in “grub2” package in Ubuntu:
  New

Bug description:
  After upgrading to quantal, grub-install says:

  Path `/boot/grub' is not readable by GRUB on boot. Installation is
  impossible. Aborting.

  My setup is 2x1TB raid1 disks. LVM on raid. /boot in LVM. This
  configuration was working before quantal. Currently I'm rebuilding my
  raid 'cos it was mdraid10 on GPT, and I tought GPT was making grub-
  install fail, but now it is mdraid1 on MBR and the problem persists.
  Maybe it is md or lvm problem (from the message "missing modules from
  core image").

  
  # dpkg-reconfigure grub-pc says:

  Generando grub.cfg ...
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  Se encontró una imagen linux: /boot/vmlinuz-3.5.0-17-generic
  Se encontró una imagen initrd: /boot/initrd.img-3.5.0-17-generic
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: error: no es un directorio.
  Se encontró una imagen linux: /boot/vmlinuz-3.2.0-32-generic
  Se encontró una imagen initrd: /boot/initrd.img-3.2.0-32-generic
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  Se encontró una imagen linux: /boot/vmlinuz-3.5.0-17-generic
  Se encontró una imagen initrd: /boot/initrd.img-3.5.0-17-generic
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: error: no es un directorio.
  Se encontró una imagen linux: /boot/vmlinuz-3.2.0-32-generic
  Se encontró una imagen initrd: /boot/initrd.img-3.2.0-32-generic
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: aviso: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
  /usr/sbin/grub-probe: error: no es un directorio.
  Found memtest86+ image: /memtest86+.bin
  Encontrado en Windows 7 (loader) en /dev/sdc1
  Encontrado en Ubuntu 12.04.1 LTS (12.04) en /dev/mapper/venkman-LXC--django
  Encontrado en Ubuntu 12.04.1 LTS (12.04) en /dev/mapper/venkman-LXC--maria
  Encontrado en Ubuntu 12.04 LTS (12.04) en /dev/mapper/venkman-LXC--monitoring
  Encontrado en Ubuntu 12.04 LTS (12.04) en /dev/mapper/venkman-LXC--samba3
  Encontrado en Ubuntu 12.04.1 LTS (12.04) en /dev/mapper/venkman-LXC--samba4
  hecho


  # LC_ALL=C fdisk -l /dev/sda

  Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
  81 heads, 63 sectors/track, 382818 cylinders, total 1953525168 sectors
  Units = sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disk identifier: 0x0007dfde

     Device Boot      Start         End      Blocks   Id  System
  /dev/sda1            2048  1953525167   976761560   fd  Linux raid autodetect

  
  # LC_ALL=C fdisk -l /dev/sdb

  Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
  81 heads, 63 sectors/track, 382818 cylinders, total 1953525168 sectors
  Units = sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disk identifier: 0x00092d82

     Device Boot      Start         End      Blocks   Id  System
  /dev/sdb1            2048  1953525167   976761560   fd  Linux raid autodetect


  # mdadm -QD /dev/md1 
  /dev/md1:
          Version : 1.2
    Creation Time : Thu Oct 18 01:01:04 2012
       Raid Level : raid1
       Array Size : 976630336 (931.39 GiB 1000.07 GB)
    Used Dev Size : 976630336 (931.39 GiB 1000.07 GB)
     Raid Devices : 2
    Total Devices : 2
      Persistence : Superblock is persistent

      Update Time : Thu Oct 18 10:45:54 2012
            State : clean, degraded, recovering 
   Active Devices : 1
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 1

   Rebuild Status : 52% complete

             Name : venkman:1  (local to host venkman)
             UUID : 9a5a5452:6637c622:a13521f7:3e865bae
           Events : 14392

      Number   Major   Minor   RaidDevice State
         0       8       17        0      active sync   /dev/sdb1
         2       8        1        1      spare rebuilding   /dev/sda1

  
  # pvs
    PV         VG      Fmt  Attr PSize   PFree  
    /dev/md1   venkman lvm2 a--  931,38g 186,26g

  
  # mount | grep boot
  /dev/mapper/venkman-boot on /boot type ext3 (rw,noatime)

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