Invalid Windows entry in GRUB2.00

[Miguel6692]

Ubuntu12.10 and Windows7 dualboot.

Default Windows entry in GRUB menu fails to load Windows
Code:
menuentry 'Windows 7 (loader) (sur /dev/sda3)' --class windows --class os $menuentry_id_option 'osprober-chain-CC0CC8FE0CC8E494' {
 insmod ldm
 insmod ntfs
 set root='ldm/f4f4081f-1997-11e0-809d-0022fb714c30/Volume1'
 if [ x$feature_platform_search_hint = xy ]; then
   search --no-floppy --fs-uuid --set=root --hint-bios=hd0 --hint-efi=hd0 --hint-baremetal=ahci0 --hint='ldm/f4f4081f-1997-11e0-809d-0022fb714c30/Volume1' CC0CC8FE0CC8E494
 else
   search --no-floppy --fs-uuid --set=root CC0CC8FE0CC8E494
 fi
 chainloader +1
}

The following custom entry is able to boot Windows:

Code:
menuentry 'Windows 7 on /dev/sda3 MANUAL' {
   insmod part_msdos
   insmod ntfs
   set root=(hd0,3)
   chainloader +1
}

Original thread: http://ubuntuforums.org/showthread.php?t=2077278

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: grub2 (not installed)
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Tue Oct 30 19:39:26 2012
InstallationDate: Installed on 2011-05-03 (546 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MarkForUpload: True
SourcePackage: grub2
UpgradeStatus: Upgraded to quantal on 2012-10-27 (3 days ago)

[Miguel6692 (mm6692)]

Changing package grub2 (not installed on my PC) to grub-pc

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Phillip Susi (psusi)]

Please run sudo fdisk -lu and post the output.

[Miguel6692 (mm6692)]

Here it is :

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 têtes, 63 secteurs/piste, 60801 cylindres, total 976773168 secteurs
Unités = secteurs de 1 * 512 = 512 octets
Taille de secteur (logique / physique) : 512 octets / 512 octets
taille d'E/S (minimale / optimale) : 512 octets / 512 octets
Identifiant de disque : 0xc260a926

Périphérique Amorce Début Fin Blocs Id Système
/dev/sda1 2048 28674047 14336000 27 Hidden NTFS WinRE
/dev/sda2 507654061 976771071 234558505+ 5 Étendue
/dev/sda3 * 36014080 36218879 102400 7 HPFS/NTFS/exFAT
/dev/sda4 36218880 507650047 235715584 7 HPFS/NTFS/exFAT
/dev/sda5 507654063 876281489 184313713+ 7 HPFS/NTFS/exFAT
/dev/sda6 968773632 976771071 3998720 82 partition d'échange Linux / Solaris
/dev/sda7 876281856 968765439 46241792 83 Linux

Les entrées de la table de partitions ne sont pas dans l'ordre du disque