don't use /etc/network/interfaces.d/iiab

roles/network/defaults/main.yml

@@ -4,6 +4,7 @@ wireless_lan_present: False
 strict_networking: False
 iiab_demo_mode: False
 gui_static_wan: False
+has_NM: False
 
 # Set defaults for discovery process as strings
 wifi1: "not found-1"

roles/network/tasks/debian.yml

@@ -37,7 +37,7 @@
 - name: Copy the bridge script
   template: dest=/etc/network/interfaces.d/iiab
             src=network/systemd.j2
-  when: not is_rpi and (iiab_lan_iface == "br0" or wan_ip != "dhcp")
+  when: not is_rpi and not has_NM and (iiab_lan_iface == "br0" or wan_ip != "dhcp")
 
 - name: Copy the bridge script for RPi
   template: dest=/etc/network/interfaces.d/iiab