- hosts: all
  tasks:
  - name: Run whoami without become.
    command: whoami
    changed_when: false
    become: false
    register: whoami

  - name: Set a fact with the user name.
    set_fact:
      login_user: "{{ whoami.stdout }}"
  - name: Update Ubuntu
    apt:
      upgrade: true
      update_cache: true
    become: true