---
- name: Check for /etc/network/interfaces
  stat:
    path: /etc/network/interfaces
  register: debian_interfaces


- name: Fix evil Debian default /etc/network/interfaces
  lineinfile:
    dest: /etc/network/interfaces
    regexp: 'source.*interfaces.d'
    line: 'source-directory /etc/network/interfaces.d'
    backup: yes
  when: debian_interfaces.stat.exists