store background images in /opt/background

tasks/main.yml

@@ -54,7 +54,7 @@
 
 - name: background image directory
   file:
-    path: /usr/share/lightdm/background
+    path: /opt/backgrounds
     state: directory
 
 - name: background image

vars/main.yml

@@ -2,4 +2,4 @@ _display_manager_valid_states:
   - multiuser
   - maintenance
 
-display_manager_background_image_path: /usr/share/lightdm/background/{{display_manager_background_image|basename}}
+display_manager_background_image_path: /opt/backgrounds/{{display_manager_background_image|basename}}