diff -Nru apturl-0.5.2ubuntu4/AptUrl/gtk/backend/InstallBackendSynaptic.py apturl-0.5.2ubuntu4.1/AptUrl/gtk/backend/InstallBackendSynaptic.py
--- apturl-0.5.2ubuntu4/AptUrl/gtk/backend/InstallBackendSynaptic.py	2013-12-11 14:16:03.000000000 +0400
+++ apturl-0.5.2ubuntu4.1/AptUrl/gtk/backend/InstallBackendSynaptic.py	2017-09-23 15:18:13.000000000 +0300
@@ -7,7 +7,7 @@
 import tempfile
 from gettext import gettext as _
 
-from gi.repository import GObject
+from gi.repository import GObject, GdkX11 # https://bugzilla.gnome.org/673396
 
 from UpdateManager.backend import InstallBackend
 
@@ -15,6 +15,9 @@
 class InstallBackendSynaptic(InstallBackend):
     """ Install backend based on synaptic """
 
+    def __init__(self, window_main):
+        InstallBackend.__init__(self, window_main, self.ACTION_INSTALL)
+
     def _run_synaptic(self, action, opt, tempf):
         """Execute synaptic."""
         try:
@@ -25,7 +28,7 @@
                "--desktop", "/usr/share/applications/update-manager.desktop", 
                "--", "/usr/sbin/synaptic", "--hide-main-window",  
                "--non-interactive", "--parent-window-id",
-               "%s" % self.window_main.window.xid ]
+               "%s" % self.window_main.get_window().get_xid() ]
         cmd.extend(opt)
         flags = GObject.SPAWN_DO_NOT_REAP_CHILD
         (pid, stdin, stdout, stderr) = GObject.spawn_async(cmd, flags=flags)
@@ -39,7 +42,7 @@
         action, tempf = data
         if tempf:
             tempf.close()
-        self.emit("action-done", action, True, os.WEXITSTATUS(condition) == 0, None, None)
+        self._action_done(action, True, os.WEXITSTATUS(condition) == 0, None, None)
 
     def update(self):
         opt = ["--update-at-startup"]
@@ -65,4 +68,4 @@
         opt.append("--set-selections-file")
         opt.append("%s" % tempf.name)
         tempf.flush()
-        self._run_synaptic(self.INSTALL, opt, tempf)
+        self._run_synaptic(self.ACTION_INSTALL, opt, tempf)
diff -Nru apturl-0.5.2ubuntu4/debian/changelog apturl-0.5.2ubuntu4.1/debian/changelog
--- apturl-0.5.2ubuntu4/debian/changelog	2014-03-16 06:56:58.000000000 +0400
+++ apturl-0.5.2ubuntu4.1/debian/changelog	2017-09-23 14:52:56.000000000 +0300
@@ -1,3 +1,9 @@
+apturl (0.5.2ubuntu4.1) UNRELEASED; urgency=medium
+
+  * Make Synaptic backend actually work (LP: #1338482)
+
+ -- Vlad Orlov <monsta@inbox.ru>  Sat, 23 Sep 2017 14:52:08 +0300
+
 apturl (0.5.2ubuntu4) trusty; urgency=medium
 
   * Drop libgtk2-perl Recommends to Suggests.