[Bug 1374008] Re: update-grub causes error messages when accessing extended partition

[మంగిపూడి కోదండరామ్ (Mangipudi Kodanda Ram)]

I have upgraded to vivid a couple of days ago, and having this problem.

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Title:
  update-grub causes error messages when accessing extended partition

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Running update-grup causes a lot of scary error messages being logged
  in dmesg because it fails to recognize the extended partition type (so
  it appears).

  [ 1589.825598] Btrfs loaded
  [ 1590.143489] EXT4-fs (sda2): unable to read superblock
  [ 1590.147775] EXT4-fs (sda2): unable to read superblock
  [ 1590.152399] EXT4-fs (sda2): unable to read superblock
  [ 1590.158651] FAT-fs (sda2): invalid media value (0x60)
  [ 1590.158661] FAT-fs (sda2): Can't find a valid FAT filesystem
  [ 1590.196531] XFS (sda2): Invalid superblock magic number
  [ 1590.206640] FAT-fs (sda2): invalid media value (0x60)
  [ 1590.206652] FAT-fs (sda2): Can't find a valid FAT filesystem
  [ 1590.220111] MINIX-fs: unable to read superblock
  [ 1590.245014] attempt to access beyond end of device
  [ 1590.245027] sda2: rw=16, want=3, limit=2
  [ 1590.245033] hfsplus: unable to find HFS+ superblock
  [ 1590.254463] qnx4: no qnx4 filesystem (no root dir).
  [ 1590.257698] You didn't specify the type of your ufs filesystem

  Disk /dev/sda: 233,8 GiB, 251059544064 bytes, 490350672 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
  Disklabel type: dos
  Disk identifier: 0xce28d9ab

  Device     Boot  Start       End   Sectors   Size Id Type
  /dev/sda1  *      2048    499711    497664   243M 83 Linux
  /dev/sda2       501758 490348543 489846786 233,6G  5 Extended
  /dev/sda5       501760 490348543 489846784 233,6G 8e Linux LVM

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: grub-common 2.02~beta2-11
  ProcVersionSignature: Ubuntu 3.16.0-17.23-generic 3.16.3
  Uname: Linux 3.16.0-17-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: i386
  CurrentDesktop: Unity
  Date: Thu Sep 25 17:19:42 2014
  InstallationDate: Installed on 2014-09-25 (0 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha i386 (20140923)
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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