Merge pull request #396 from dale-c-anderson/382-fix-apt-errors-on-po…

…p-os

Fix apt errors on Pop!_OS

defaults/main.yml

@@ -32,10 +32,13 @@ docker_add_repo: true
 # Docker repo URL.
 docker_repo_url: https://download.docker.com/linux
 
-# Used only for Debian/Ubuntu. Switch 'stable' to 'nightly' if needed.
+# Used only for Debian/Ubuntu/Pop!_OS/Linux Mint. Switch 'stable' to 'nightly' if needed.
 docker_apt_release_channel: stable
+# docker_apt_ansible_distribution is a workaround for Ubuntu variants which can't be identified as such by Ansible,
+# and is only necessary until Docker officially supports them.
+docker_apt_ansible_distribution: "{{ 'ubuntu' if ansible_distribution in ['Pop!_OS', 'Linux Mint'] else ansible_distribution }}"
 docker_apt_arch: "{{ 'arm64' if ansible_architecture == 'aarch64' else 'amd64' }}"
-docker_apt_repository: "deb [arch={{ docker_apt_arch }} signed-by=/etc/apt/trusted.gpg.d/docker.asc] {{ docker_repo_url }}/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} {{ docker_apt_release_channel }}"
+docker_apt_repository: "deb [arch={{ docker_apt_arch }} signed-by=/etc/apt/trusted.gpg.d/docker.asc] {{ docker_repo_url }}/{{ docker_apt_ansible_distribution | lower }} {{ ansible_distribution_release }} {{ docker_apt_release_channel }}"
 docker_apt_ignore_key_error: true
 docker_apt_gpg_key: "{{ docker_repo_url }}/{{ ansible_distribution | lower }}/gpg"
 docker_apt_gpg_key_checksum: "sha256:1500c1f56fa9e26b9b8f42452a553675796ade0807cdce11975eb98170b3a570"