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I have searched everywhere on the internet and I cannot seem to find a solution to this problem. I have an Alienware Aurora and with it came Windows 7. Recently, I inserted an additional HDD and installed Ubuntu on it. Upon boot up, I do not have the option of booting to a specific OS. I checked and everything is still on the original drive. I even went into my BIOS and tried to switch the drive from which the computer booted, but there was no option for the original drive. I also tried using boot-repair to no avail. Thanks in advance for the help. I realize that similar questions have been asked on these forums but none of them seem to be any help to me. Edit: I meant to add that I tried removing the Ubuntu drive therefore forcing it to boot to Windows. When I did this, it started a GRUB command line which I am completely unfamiliar with.

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Take a look at Grub Customizer. – Mitch Aug 15 '13 at 16:06
please indicate the URL provided by Boot-Repair. – LovinBuntu Aug 16 '13 at 9:15

You just need to add entry in Grub to boot windows.

So just edit /etc/grub.d/40_custom (using SUDO) and add the following lines to the bottom of the file:

menuentry ‘Windows 7′ {
set root=’(hd0,msdos2)’
chainloader +1

(hd0,msdos2) Refers to first HDD ( /dev/sda2 ).

After making changes into grub, you need to update grub.cfg by using below command.

sudo update-grub2

Now when you boot your system, you will get Option to boot Ubuntu or Windows.

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that's also happen to me, maybe you can try to press F9 after you restart your computer. then there's a different drives will pop up then choose what you want.

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