AWS migrations only work if the disk partition scheme of boot volume is in MBR. So we need to manualy convert the boot volume partition before starting the migration process. For the conversion, we use a utility called gdisk. Follow the below steps to convert GPT boot volumes to MBR.
Execute below command to check the partition scheme of the disk
gdisk -l /dev/sda
Execute below command to start converting the disk from MBR to GPT
After entering the interactive console of gdisk, enter r to select Recovery and transformation options then press g to Convert GPT into MBR and exit then Print the MBR partition table by pressing p and press w to write the partition table and exit.
Reboot the server