I installed Ubuntu 15.10 on a 60GB SSD. Then, some weeks later, I installed Windows 10 on a separate 500GB HDD (Ubuntu deserves the SSD more than Windows!).
Basically, my problem is that neither of the OS's know of each other, and in order to select the OS on startup, I have to enter the BIOS and manually boot off one or the other. How can I use either the Windows Boot Manager or GRUB2 to select which one I want to boot, the way most dual-boot systems are set up?
P.S. Both OS's work perfectly fine (I unplugged the Ubuntu disk when I installed Windows 10) and nothing is broken.