Install wordpress from backports and do not specify standardoption when mounting aufs

wordpress/tasks/main.yml

 ---
 # file: roles/wordpress/tasks/main.yml
 
-- name: ensure packages for wordpress are installed
-  apt: name={{ item }} state=latest install_recommends=no
-  with_items:
+- name: ensure we have aufs tools
+  apt: name=aufs-tools state=latest install_recommends=no
+  tags:
+    - packages
     - wordpress
-    - aufs-tools
+
+- name: ensure the wordpress package from backports is installed
+  apt: name=wordpress state=latest install_recommends=no default-release=jessie-backports
   tags:
     - packages
     - wordpress
@@ -83,7 +86,7 @@
     state: mounted
     fstype: aufs
     name: "{{ wordpress_web_root }}/{{ wordpress_name }}/"
-    opts: "br={{ wordpress_web_root }}/{{ wordpress_name }}-files/:/usr/share/wordpress udba=reval"
+    opts: "br={{ wordpress_web_root }}/{{ wordpress_name }}-files/:/usr/share/wordpress"
     src: none
   tags:
     - mount