- name: create file to write in
  become: false
  command: touch output.txt

- name: call apt update
  become: true
  shell: apt update
  register: os_info

- name: write to output.txt
  copy:
    content: "{{os_info.stdout_lines}}" 
    dest: output.txt
  
- debug: 
    msg: "{{os_info.stdout_lines}}"