Enable SSH password authentication

cloud-init.yaml

#cloud-config
users:
  - name: ubuntu
    shell: /bin/bash
    sudo: ['ALL=(ALL) NOPASSWD:ALL']
ssh_pwauth: True ## This line enables ssh password authentication
chpasswd:
  list: |
    ubuntu:ubuntu ## Overriding default username, password
  expire: True ## Forcing user to change the default password at first login