If the message you are seeing is "This GPT partition label has no BIOS Boot Partition; embedding won't be possible!", then see http://grub.enbug.org/BIOS_Boot_Partition
If the message you are seeing is "This GPT partition label has no BIOS Boot Partition; embedding won't be possible!", then see http:// grub.enbug. org/BIOS_ Boot_Partition