I have a laptop with Debian 7, Windows 7 and Ubuntu 13.04. I have decided to upgrade to Ubuntu 13.10, and installed the Ubuntu partition afresh.

After the re-installation, Windows 7 disappeared from the grub menu. I booted the machine with a live cd and started boot-repair.

Boot-repair seemed to have identified the installed OS's well, including the Windows partition:

...

sda5: __________________________________________________________________________



    File system:       ext4

    Boot sector type:  Grub2 (v1.99-2.00)

    Boot sector info:  Grub2 (v1.99-2.00) is installed in the boot sector of 

                       sda5 and looks at sector 817082808 of the same hard 

                       drive for core.img, but core.img can not be found at 

                       this location.

    Operating System:  Ubuntu 13.10 

    Boot files:        /boot/grub/grub.cfg /etc/fstab 

                       /boot/grub/i386-pc/core.img

...    

And the installation went well without errors:

grub-install (GRUB) 2.00-19ubuntu2.1,grub-install (GRUB) 2.



Reinstall the GRUB of sda5 into the MBR of sda

Installation finished. No error reported.

grub-install /dev/sda: exit code of grub-install /dev/sda:0



chroot /mnt/boot-sav/sda5 update-grub

Generating grub.cfg ...

Found linux image: /boot/vmlinuz-3.11.0-15-generic

Found initrd image: /boot/initrd.img-3.11.0-15-generic

Found linux image: /boot/vmlinuz-3.11.0-12-generic

Found initrd image: /boot/initrd.img-3.11.0-12-generic

Found Debian GNU/Linux (7.0) on /dev/sda6

Unhide GRUB boot menu in sda5/boot/grub/grub.cfg



Boot successfully repaired.



You can now reboot your computer.

The full report is available here.

Still, after reboot I only see the Ubuntu and Debian records in grub, without the Windows 7 section:

Any idea what's wrong with the boot-repair fix attempt?