--- /dev/null
+#!/bin/sh
+
+set -e
+
+# Load debconf
+. /usr/share/debconf/confmodule
+db_version 2.0
+
+# Show dialogs if started from postinst
+if [ "$CN_POSTINST" ]; then
+ rm -f /var/lib/carnet-upgrade/debconf-priority 2>/dev/null
+ rm -f /var/lib/carnet-upgrade/check-services 2>/dev/null
+
+ # display installation notice for new version
+ db_fset carnet-upgrade/short-instructions seen false
+ db_input high carnet-upgrade/short-instructions || true
+fi
+
+db_go || true
+db_stop || true