gistfile1.txt

cjac@sh0:~/ansible$ cat apt-upgrade.yml
---
- name: apt upgrade
  apt:
    hosts: all
    upgrade: dist
    update_cache: True
cjac@sh0:~/ansible$ ansible-playbook apt-upgrade.yml 
ERROR! 'apt' is not a valid attribute for a Play

The error appears to be in '/home/cjac/ansible/apt-upgrade.yml': line 2, column 3, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

---
- name: apt upgrade
  ^ here