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After I installed Ubuntu on a separate HDD for someone, I was unable to boot into Windows or the Grub option without entering Grub rescue. And after I tweaked /etc/default/grub, I am able to enter into Grub, but Grub will not recognize Windows 7 which is installed on my main drive. How can I get Grub to boot into Windows? Ubuntu and Windows are both on separate drives.

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  • Did you tried sudo update-grub while in Ubuntu?
    – Braiam
    Nov 5, 2013 at 0:43

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If Grub doesn't recognize Ubuntu after being repaired, but Ubuntu boots, open a terminal in Ubuntu and run the following command (as @Braiam also suggested):

sudo update-grub

It will refresh the Grub menu and add any other detected operating systems to the Grub menu and enable you to choose to boot from them on startup.

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Or if above one still dosen't work , you can make sure you have the following :-

sudo apt-get install os-prober

then sudo update-grub

and that will force grub to look for existing OSes as well!`

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