diff --git a/debian/postinst b/debian/postinst
new file mode 100644
index 00000000..cbc8a779
--- /dev/null
+++ b/debian/postinst
@@ -0,0 +1,53 @@
+#!/bin/sh
+# postinst script for mobilizon.
+#
+# See: dh_installdeb(1).
+
+set -e
+
+# 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>
+#        * <postinst> 'abort-remove'
+#        * <deconfigured's-postinst> 'abort-deconfigure' 'in-favour'
+#          <failed-install-package> <version> 'removing'
+#          <conflicting-package> <version>
+# for details, see https://www.debian.org/doc/debian-policy/ or
+# the debian-policy package.
+
+
+case "$1" in
+    configure)
+        # TODO create system user
+        if ! getent passwd mobilizon >/dev/null; then
+            adduser \
+              --disabled-password \
+              --quiet \
+              --system \
+              --home /usr/share/mobilizon \
+              --no-create-home \
+              --gecos "Mobilizon server" \
+              --group \
+              mobilizon
+        fi
+        # sdf
+
+    ;;
+
+    abort-upgrade|abort-remove|abort-deconfigure)
+    ;;
+
+    *)
+        echo "postinst called with unknown argument '$1'" >&2
+        exit 1
+    ;;
+esac
+
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
+#DEBHELPER#
+
+exit 0