Fix for apt-cacher-ng for ubuntu mirrors

roles/fai/tasks/apt-cacher-ng.yml

@@ -38,6 +38,15 @@
     mode: u=rw,g=r,o=r
   register: apt_cacher_config
 
+- name:
+    copy:
+      content: |
+        http://archive.ubuntu.com/ubuntu/
+      dest: /etc/apt-cacher-ng/backends_ubuntu
+      owner: root
+      group: root
+      mode: u=rw,g=r,o=r
+
 - name: ensure service is started and enabled
   service:
     name: apt-cacher-ng