When we copy all data from AWS instance without excluding the cloud-init you will see errors as follows but it will continue to boot with success:

On Ubuntu 20.04, these steps worked for me to disable and remove cloud-init:
Run this command to disable:
sudo touch /etc/cloud/cloud-init.disabled
Reboot machine.
Run these commands to remove:
sudo apt-get purge cloud-init
sudo rm -rf /etc/cloud/; sudo rm -rf /var/lib/cloud/