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.
You just need to add entry in Grub to boot windows.
So just edit
After making changes into grub, you need to update grub.cfg by using below command.
Now when you boot your system, you will get Option to boot Ubuntu or Windows.
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.