A custom “user-data” file is required for an unattended installation of Ubuntu. We will create this template file for use in our Ansible playbook to Generate Custom Unattended Ubuntu Install ISO.

user-data.j2

#cloud-config
autoinstall:
  version: 1
  ssh:
    install-server: true
    # option "allow-pw" defaults to `true` if authorized_keys is empty, `false` otherwise.
    allow-pw: false
  storage:
    layout:
      name: lvm
      match:
        size: largest
  user-data:
    diable_root: true
    timezone: America/New_York
    package_upgrade: true
    packages:
    - network-manager
    - lldpd
    - git
    - python3-pip
    - ansible
    - arp-scan
    users:
      - name: {{ Global.username }}
        primary_group: users
        groups: sudo
        lock_passwd: true
        # passwd: "$5$IWwNqL9VUSDoc4Jv$DEUGR.cZQcbz/QvdCOmU13fX5ZW0rANg8LqkAtX3nBA" # changeme
        shell: /bin/bash
        ssh_authorized_keys:
          - "{{ Global.ssh_key }}"
        sudo: ALL=(ALL) NOPASSWD:ALL
  ansible:
    install_method: pip
    package_name: ansible
    #run_user: ansible
    galaxy:
      actions:
        - ["ansible-galaxy", "collection", "install", "community.general"]
  late-commands:
    # randomly generate the hostname & show the IP at boot
    - echo "{{ Global.system_name_prefix }}-$(openssl rand -hex 3)" > /target/etc/hostname
    # dump the IP out at login screen
    - echo "Ubuntu 22.04 LTS \nIP - $(hostname -I)\n" > /target/etc/issue

You now ready to generate a customer unattended Ubuntu server install ISO file

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