Spurious file /etc/apt/trusted.gpg.d/Launchpad_PPA_for_Ansible_Inc_.gpg needs removing
This file generates repeated warnings from APT:
The key(s) in the keyring /etc/apt/trusted.gpg.d/Launchpad_PPA_for_Ansible_Inc_.gpg are ignored as the file has an unsupported filetype.
The file contains HTML output from the launchpad.net site, presumably the result of an error or bug when installing the PPA:Ansible repo. (The actual repo key is in ansible_ubuntu_ansible.gpg
and is unaffected.) The warnings don't prevent APT from working but look untidy. The fix is to simply remove the file, which should be added as an extra task to the cu-custom role. See IN1467273 reported by @scmmpj for details.