[Bug 1316068] Re: error: disk 'hd0,msdos5' not found

[Mathieu31]

Hello,
As instructed, I disconnected the other drives, leaving the main harddrive and the DVD-RW drive.
This did not had any effect: grub 2.02 showed the same error: error: disk 'hd0,msdos5' not found.
booting from a CD and restoring grub 2.00 (sudo dkpg -i grub* in the directory where I keep a copy of the grub debs) put the system back in bootable state.
I have attached the device.map file found in /boot/grub. The identification of hd0 is correct.
Also in grub.cfg, one can read:
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos5 --hint-efi=hd0,msdos5 --hint-baremetal=ahci0,msdos5 --hint='hd0,msdos5'  94ecf542-619c-4fe7-bfed-672fa7bb2739
else
  search --no-floppy --fs-uuid --set=root 94ecf542-619c-4fe7-bfed-672fa7bb2739
fi
The uuid is indeed the one of hd0,msdos5.

msdos5 (or sda5) is the first partition within the extended partition sda3. sda1 & sda2 are primary partitions for Windows.
sda6 is the swap, and sda7 is mounted as /home. Could this be troubling Grub?

The configuration of the hardware hasn't changed since I assembled it,
and installed the Windows and Xubuntu.

I am still ready to help and test whatever solution you may come up with.
Best regards,

** Attachment added: "device.map file in use"
   https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1316068/+attachment/4394397/+files/device.map

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https://bugs.launchpad.net/bugs/1316068

Title:
  error: disk 'hd0,msdos5' not found

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  After upgrading the distribution, grub fails to boot any of the installed OSes.
  Whatever the option selected in the grub menu, I get the same error message: error: disk 'hd0,msdos5' not found.
  Unfortunately, hd0,msdos5 is the partition where the root of the Xubuntu system resides, and where the grub files (/boot) are.
  By the way, the grub menu is shown in text only, without the nice blue background it should show.
  Downgrading grub to version 2.00-19ubuntu2.1 make the system bootable again.
  I have updated the BIOS firmware, to make sure it does not solve the issue.
  A regression in  grub ?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: grub2-common 2.02~beta2-9
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon May  5 11:53:03 2014
  InstallationDate: Installed on 2013-01-07 (482 days ago)
  InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
  SourcePackage: grub2
  UpgradeStatus: Upgraded to trusty on 2014-04-26 (8 days ago)

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