This question already has an answer here:
I've been scratching my head for hours, and am completely lost. I have ubuntu installed on a separate drive, and 5 other drives I use with windows 7. I ran Boot-Repair with "Recommended Repair" and came across this error:
GPT detected. Please create a BIOS-Boot partition.
I also created a bootinfo summary, which can be viewed here: http://paste2.org/f9ZBXUHw
I have no idea how to create a BIOS-Boot partition, or where to begin.
How can I change the grub boot order so I can choose to boot into Windows 7 or Ubuntu?