Digitalocean Images Bootloader

I have downloaded raw disk images of my droplets to have local backup. One droplet image has bootloader and able to boot on VirtualBox after convert raw to vdi format.

Other two raw images don’t have bootloader. I’m able to mount and see contents of these images but they don’t boot on VirtualBox. I think some droplets have seperated bootloaders.

How can I boot the images which don’t have bootloaders?

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I solved. We need to add small partition (I added 32 MB) then change partition flag to bios_grub.

Then we can install grub like following

sudo grub-install --root-directory=/mnt/bootfix --boot-directory=/mnt/bootfix/boot /dev/sdb

Also we may need to configure grub.cfg file.