diff -Nru apturl-0.5.2ubuntu11/AptUrl/gtk/backend/InstallBackendAptdaemon.py apturl-0.5.2ubuntu11.1/AptUrl/gtk/backend/InstallBackendAptdaemon.py
--- apturl-0.5.2ubuntu11/AptUrl/gtk/backend/InstallBackendAptdaemon.py	2015-12-16 10:08:32.000000000 +0000
+++ apturl-0.5.2ubuntu11.1/AptUrl/gtk/backend/InstallBackendAptdaemon.py	2016-05-19 20:12:58.000000000 +0000
@@ -32,11 +32,11 @@
             pass
         try:
             trans = yield self.client.update_cache(defer=True)
-            yield self._run_in_dialog(trans, self.UPDATE)
+            yield self._run_in_dialog(trans, self.ACTION_UPDATE)
         except errors.NotAuthorizedError as e:
-            self._action_done(self.UPDATE, False, False, str(e), None)
+            self._action_done(self.ACTION_UPDATE, False, False, str(e), None)
         except:
-            self.action_done(self.UPDATE, True, False, None, None)
+            self.action_done(self.ACTION_UPDATE, True, False, None, None)
             raise
 
     @inline_callbacks
diff -Nru apturl-0.5.2ubuntu11/AptUrl/gtk/GtkUI.py apturl-0.5.2ubuntu11.1/AptUrl/gtk/GtkUI.py
--- apturl-0.5.2ubuntu11/AptUrl/gtk/GtkUI.py	2016-01-13 11:47:53.000000000 +0000
+++ apturl-0.5.2ubuntu11.1/AptUrl/gtk/GtkUI.py	2016-05-19 20:19:47.000000000 +0000
@@ -31,12 +31,19 @@
         self.dia_xml.set_translation_domain("apturl")
         self.dia_xml.add_from_file(APTURL_UI_FILE)
         self.dia = self.dia_xml.get_object('confirmation_dialog')
-        self.dia.start_available = lambda: Gtk.main_quit()
-        self.dia.start_error = lambda: Gtk.main_quit()
+        self.dia.start_available = self.start_available
+        self.dia.start_error = self.start_error
         self.dia.exit = lambda: Gtk.main_quit()
         self.dia.realize()
         self.backend = get_backend(self.dia)
 
+    def start_available(self, cancelled_update=False, error_occurred=False):
+        self.dia.set_sensitive(True)
+        Gtk.main_quit()
+
+    def start_error(self, is_update_error, header, desc):
+        Gtk.main_quit()
+
     def _action_done(self, backend, action, authorized, success, err_str, err_desc):
         self.dia.set_sensitive(True)
         Gtk.main_quit()
@@ -107,9 +114,7 @@
         return True
 
     def doEnableSection(self, sections):
-        cmd = ["gksu", "--desktop",
-               "/usr/share/applications/software-properties.desktop",
-               "--",
+        cmd = ["pkexec",
                "software-properties-gtk",
                "-e", "%s" % ' '.join(sections)]
         try:
@@ -127,21 +132,15 @@
 
 
     def doEnableChannel(self, channelpath, channelkey):
-        cmd = ["gksu",
-               "--desktop",
-               "/usr/share/applications/gnome-app-install.desktop",
-               "--",
+        cmd = ["pkexec",
                "install", "--mode=644","--owner=0",channelpath,
-               apt_pkg.Config.FindDir("Dir::Etc::sourceparts")]
+               apt_pkg.config.find_dir("Dir::Etc::sourceparts")]
         res = subprocess.call(cmd, universal_newlines=True)
         if res != 0:
             return False
         # install the key as well
         if os.path.exists(channelkey):
-            cmd = ["gksu",
-                   "--desktop",
-                   "/usr/share/applications/gnome-app-install.desktop",
-                   "--",
+            cmd = ["pkexec",
                    "apt-key", "add",channelkey]
             res = subprocess.call(cmd, universal_newlines=True)
             if res != 0:
diff -Nru apturl-0.5.2ubuntu11/AptUrl/kde/KdeUI.py apturl-0.5.2ubuntu11.1/AptUrl/kde/KdeUI.py
--- apturl-0.5.2ubuntu11/AptUrl/kde/KdeUI.py	2015-12-16 10:08:32.000000000 +0000
+++ apturl-0.5.2ubuntu11.1/AptUrl/kde/KdeUI.py	2016-05-19 20:13:35.000000000 +0000
@@ -115,7 +115,7 @@
         cmd = ["kdesudo",
                "--",
                "install", "--mode=644","--owner=0",channelpath,
-               apt_pkg.Config.FindDir("Dir::Etc::sourceparts")]
+               apt_pkg.config.find_dir("Dir::Etc::sourceparts")]
         res = subprocess.call(cmd, universal_newlines=True)
         if res != 0:
             return False
diff -Nru apturl-0.5.2ubuntu11/debian/changelog apturl-0.5.2ubuntu11.1/debian/changelog
--- apturl-0.5.2ubuntu11/debian/changelog	2016-01-13 11:48:22.000000000 +0000
+++ apturl-0.5.2ubuntu11.1/debian/changelog	2016-05-24 16:00:24.000000000 +0000
@@ -1,3 +1,19 @@
+apturl (0.5.2ubuntu11.1) xenial; urgency=medium
+
+  * Fix common crashes (AttributeError in doEnableChannel), due to changes
+    in apt_pkg API, etc. (LP: #1566201)
+
+  [ Brian Murray ]
+  * Port to proper apt_pkg APIs.
+
+  [ Mathieu Trudel-Lapierre ]
+  * Override the start_available and start_error functions from Aptdaemon
+    backend correctly to match the passed parameters.
+  * Use pkexec rather than gksu to do our external calls to apt-key, install,
+    and software-properties, etc; since they need admin privileges.
+
+ -- Mathieu Trudel-Lapierre <cyphermox@ubuntu.com>  Tue, 24 May 2016 12:00:20 -0400
+
 apturl (0.5.2ubuntu11) xenial; urgency=medium
 
   * Drop webkit1 support, we're switching to pure webkit2 now