My user-data for autoinstall ubuntu server.

user-data.yml

#cloud-config
autoinstall:
  apt:
    geoip: true
    preserve_sources_list: false
    primary:
    - arches: [amd64, i386]
      uri: http://mirrors.tuna.tsinghua.edu.cn/ubuntu
    - arches: [default]
      uri: http://ports.ubuntu.com/ubuntu-ports
  interactive-sections:
    - identity
  keyboard: {layout: us, toggle: null, variant: ''}
  locale: en_US
  network:
    ethernets:
      ens160: {dhcp4: true}
    version: 2
  ssh:
    allow-pw: false
    authorized-keys: []
    install-server: true
  storage:
    layout:
      name: direct
  version: 1

Reference: https://ubuntu.com/server/docs/install/autoinstall-quickstart