I have a few Ubuntu 20.04 servers that I want to update using Ansible, but a simple task as apt update is failing.

Ansible:

---
- name: Debugging
  hosts: all
  gather_facts: false
  become: true
  tasks:
    - name: Run just apt update
      ansible.builtin.apt:
        update_cache: true

It fails with the following:

fatal: [<hostname>]: FAILED! => {“changed”: false, “msg”: “Failed to update apt cache: unknown reason”}

When running sudo apt update manually on the hosts in runs without any errors:

$ sudo apt update
Hit:1 https://<repo url>/repository/apt-ubuntu focal InRelease
Hit:2 https://<repo url>/repository/apt-ubuntu focal-updates InRelease
Hit:3 https://<repo url>/repository/apt-ubuntu focal-backports InRelease
Hit:4 https://<repo url>/repository/apt-ubuntu focal-security InRelease
Hit:5 https://<repo url>/repository/apt-salt-focal-3004 focal InRelease
Hit:6 http://<repo url 2>/debian-octopus focal InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
$

So no gpg errors or failing repositories. What could cause this?