So I booted the live USB again and: 1. scan and assemble the array * mdadm --assemble --scan 2. mount /dev/md0 /mnt 3. mount /dev/sda1 /mnt/boot 4. mount -o bind /dev /mnt/dev 5. mount -o bind /sys /mnt/sys 6. mount -o bind /proc /mnt/proc 7. chroot /mnt 8. apt-get purge grub grub-pc grub-common 9. apt-get install grub-pc grub-common * (install grub to /dev/sda) 10. exit 11. reboot
Not it boots up and runs without issue
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