If you're trying to start a cloud-init based Ubuntu VM with KVM you will suffer long boot times and confusing output on the terminal. If you want to get rid of it you need to remove cloud-init.

1. wait until the VM boots
2. login
3. echo 'datasource_list: [ None ]' | sudo -s tee /etc/cloud/cloud.cfg.d/90_dpkg.cfg
4. sudo apt-get purge cloud-init
5. sudo rm -rf /etc/cloud/; sudo rm -rf /var/lib/cloud/
6. reboot

Disable only

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Touch the file /etc/cloud/cloud-init.disabled or use the kernel parameter cloud-init=disabled to disable cloud-init without completely removing it.