This question got a downvote, and I have no idea why. If you have a good enough reason to do so, please share.
OK, I know that this question has been asked a lot before, but I could not find any questions that exactly relate to my case. I just got a new PC with Windows 10 on an SSD. With my previous PC I had two hard drives, one with Ubuntu, one with Windows 7. I dual booted flawlessly with that setup. Now, I have moved these two HDD's to the new PC, but I would like to know how I can use my HDD with the existing Ubuntu on it to dual boot with the new Windows 10.
My new PC has Windows 10 installed.
I moved my HDD containing an existing Ubuntu installation to the new PC.
I would like to set this up such that I can dual boot with windows 10 and ubuntu. Note, both operating systems are already installed on different HDD's, but the ubuntu installation was installed alongside Windows 7 originally (see extra info below). I just need to make them dual boot together. I can already boot into Ubuntu through my BIOS settings (by making the HDD containing Ubuntu the primary HDD), but I would not like to do that every time.
When I boot from the HDD containing Ubuntu, the grub menu comes on, with Windows 7 still as an option, but I cannot boot into Windows 7 though.