debconf answer for lightdm did not work and I don't understand debconf.

Just prevent others from modifying the config file with immutable bit.
schlomo · Oct 4, 2013 · 6473645 · 6473645
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commit 6473645
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diff --git a/.gitignore b/.gitignore
@@ -1 +1,2 @@
 build/
+out/
diff --git a/out/kiosk-browser_1.20_all.deb b/out/kiosk-browser_1.20_all.deb
diff --git a/src/DEBIAN/control b/src/DEBIAN/control
@@ -1,5 +1,5 @@
 Package: kiosk-browser
-Version: 21
+Version: 22
 Priority: optional
 Section: web
 Architecture: all

diff --git a/src/DEBIAN/postinst b/src/DEBIAN/postinst
@@ -6,8 +6,11 @@ if ! getent passwd kiosk-browser >/dev/null; then
     mkdir -p /var/lib/kiosk-browser
 fi
 
-# disable lightdm and enable nodm
+# disable lightdm and enable nodm AND MAKE IT STICK :-)
+chattr -i /etc/X11/default-display-manager || :
 echo "/usr/sbin/nodm" >/etc/X11/default-display-manager
+chattr +i /etc/X11/default-display-manager || :
+
 # disable X cursor
 sed -i -e 's/NODM_X_OPTIONS=.*/NODM_X_OPTIONS="-nocursor -nolisten tcp"/' -e 's/NODM_ENABLED=.*/NODM_ENABLED=true/' -e 's/NODM_USER=.*/NODM_USER=kiosk-browser/' /etc/default/nodm
 

diff --git a/src/DEBIAN/preinst b/src/DEBIAN/preinst