I'm new to Ubuntu installation. Somehow I installed a dual boot with Windows 8 alongside Ubuntu by following this link, but today somehow always the grub command prompt is loading. I found an issue with hd0 in grub. I got to know that issue with grub, so I ran Boot-Repair through a live USB, and I got the following error:
GPT detected.
Please create a BIOS-Boot partition(>1MB, unformatted filesystem, bio_grub flag).
This can be performed via tools such as GParted. Then try again.
Using GParted I created a new partition with unformatted file system, but there is no option to manage flag so I'm unable to add 'bios_grub'. Below image is GParted view, and /sdb9
is a Linux partition.