Fix Ubuntu installation issue if dirmngr isn't present.

molecule/default/converge.yml

@@ -3,5 +3,10 @@
   hosts: all
   become: true
 
+  pre_tasks:
+    - name: Update apt cache.
+      apt: update_cache=true cache_valid_time=300
+      when: ansible_os_family == 'Debian'
+
   roles:
     - role: geerlingguy.ansible

tasks/setup-Ubuntu.yml

@@ -1,4 +1,9 @@
 ---
+- name: Ensure dirmngr is installed (gnupg dependency).
+  apt:
+    name: dirmngr
+    state: present
+
 - name: Add ansible repository.
   apt_repository: repo='ppa:ansible/ansible'