Public bug reported:

Binary package hint: grub2

after running update-grub the windows entry looks like  this

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sde1)" {
        chainloader +1
}
### END /etc/grub.d/30_os-prober ###

this will NOT boot windows. "Inavlid signature" error message.

The original after installation which boots ok looks like this

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sda1)" {
        insmod ntfs
        set root=(hd0,1)
        search --no-floppy --fs-uuid --set 90940fdf940fc6a6
        chainloader +1
}
### END /etc/grub.d/30_os-prober ###

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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cannot boot windows after update-grub
https://bugs.launchpad.net/bugs/527897
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