Disable cloud-init in Ubuntu Servers

To disable cloud-init in Ubuntu server, create the following file

touch /etc/cloud/cloud-init.disabled

To completely remove cloud-init, uninstall the package and delete the folders

  sudo dpkg-reconfigure cloud-init (uncheck everything except "None")
  sudo apt-get purge cloud-init
  sudo rm -rf /etc/cloud/ && sudo rm -rf /var/lib/cloud/
  sudo reboot