Here is my situation. I originally (only) have Ubuntu 14.04 on my laptop. Then, I installed Windows 10 into a free partition. Now, even though Ubuntu's partitions remained, I'm not able to enter Ubuntu when booting. I'm expecting this to happen when I was installing Windows 10, but I don't know how to add the existing Ubuntu to boot menu to fix it. It's fine for me either the boot menu is GRUB or Windows.
Any help is sincerely appreciated!
