If you do a start VM using Ubuntu VM with KVM, you will get long boot times. That is because cloud-init trying to auto initialization for your cloud instance. You can remove cloud-init permanently, by following this guide
1. Disable all cloud-init service
dpkg-reconfigure cloud-init
Then, disable all data sources. By pressing “space” in box section. Then press “Tab” and press “enter” for choose OK
2. After that, uninstall the package and delete the cloud-init folder
sudo apt remove cloud-init --autoremove && sudo apt purge cloud-init* && sudo rm -rf /etc/cloud/ && sudo rm -rf /var/lib/cloud/
3. Restart your VM
sudo reboot
That’s it. Now cloud-init is totally removed from your VM ^_^