- hosts: all
  tasks:

  - name: Upgrade packages.
    become: yes
    apt:
      update_cache: yes
      upgrade: full
      autoremove: yes
      purge: yes
      autoclean: yes

  - name: Check for /run/reboot-required.
    stat:
      path: /run/reboot-required
    no_log: true
    register: st

  - debug:
      msg: Reboot required.
    when: st.stat.exists