diff --git a/debian/postinst b/debian/postinst
index 279301c20..564c9e1eb 100644
--- a/debian/postinst
+++ b/debian/postinst
@@ -1,56 +1,85 @@
 #!/bin/bash
+#!/bin/sh
+# postinst script for yunohost-config-metronome
 
-TMP=/usr/share/yunohost/yunohost-config/moulinette
+set -e
 
-if [ ! -d /etc/yunohost ];
-then
-    mkdir -p /etc/yunohost
-fi
+do_configure() {
+  TMP=/usr/share/yunohost/yunohost-config/moulinette
 
-# Allow users to access /media directory
-if [ ! -d /etc/skel/media ];
-then
-    mkdir -p /media
-    ln -s /media /etc/skel/
-fi
+  if [ ! -d /etc/yunohost ];
+  then
+      mkdir -p /etc/yunohost
+  fi
 
-#Firewall
-grep -q "UPNP:" /etc/yunohost/firewall.yml > /dev/null 2>&1
-if [[ $? -eq 0 ]] || [ ! -f /etc/yunohost/firewall.yml ];
-then
-    cp $TMP/firewall.yml /etc/yunohost/
-fi
+  # Allow users to access /media directory
+  if [ ! -d /etc/skel/media ];
+  then
+      mkdir -p /media
+      ln -s /media /etc/skel/
+  fi
 
-# App fetchlist
-if [ -f /etc/cron.d/yunohost-applist-yunohost ];
-then
-    sed -i "s/--no-ldap //g" /etc/cron.d/yunohost-applist-yunohost
-fi
+  #Firewall
+  grep -q "UPNP:" /etc/yunohost/firewall.yml > /dev/null 2>&1
+  if [[ $? -eq 0 ]] || [ ! -f /etc/yunohost/firewall.yml ];
+  then
+      cp $TMP/firewall.yml /etc/yunohost/
+  fi
 
-# Service list
-if [ ! -f /etc/yunohost/services.yml ];
-then
-    cp $TMP/services.yml /etc/yunohost/
-fi
+  # App fetchlist
+  if [ -f /etc/cron.d/yunohost-applist-yunohost ];
+  then
+      sed -i "s/--no-ldap //g" /etc/cron.d/yunohost-applist-yunohost
+  fi
 
-# Stop old API
-ps aux | grep "yunohost.tac" | grep -qv grep
-if [[ $? -eq 0 ]];
-then
-    killall twistd
-fi
+  # Service list
+  if [ ! -f /etc/yunohost/services.yml ];
+  then
+      cp $TMP/services.yml /etc/yunohost/
+  fi
 
-rm -rf /var/cache/moulinette/*
-update-rc.d yunohost-api defaults
-service yunohost-api restart
+  # Stop old API
+  ps aux | grep "yunohost.tac" | grep -qv grep
+  if [[ $? -eq 0 ]];
+  then
+      killall twistd
+  fi
 
-# Reload SSOwat conf if obsolete
-if [ -f /etc/yunohost/installed ];
-then
-    yunohost firewall upnp | grep -qi "true"
-    if [[ $? -eq 0 ]];
-    then
-        yunohost firewall upnp enable
-    fi
-    yunohost app ssowatconf
-fi
+  rm -rf /var/cache/moulinette/*
+  update-rc.d yunohost-api defaults
+  service yunohost-api restart
+
+  # Reload SSOwat conf if obsolete
+  if [ -f /etc/yunohost/installed ];
+  then
+      yunohost firewall upnp | grep -qi "true"
+      if [[ $? -eq 0 ]];
+      then
+          yunohost firewall upnp enable
+      fi
+      yunohost app ssowatconf
+  fi
+}
+
+# summary of how this script can be called:
+#        * <postinst> `configure' <most-recently-configured-version>
+#        * <old-postinst> `abort-upgrade' <new version>
+#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
+#          <new-version>
+#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
+#          <failed-install-package> <version> `removing'
+#          <conflicting-package> <version>
+# for details, see http://www.debian.org/doc/debian-policy/ or
+# the debian-policy package
+
+case "$1" in
+    configure)
+        do_configure
+    ;;
+    abort-upgrade|abort-remove|abort-deconfigure)
+    ;;
+    *)
+        echo "postinst called with unknown argument \`$1'" >&2
+        exit 1
+    ;;
+esac