diff -Nru update-manager-16.10.2/debian/changelog update-manager-16.10.3/debian/changelog
--- update-manager-16.10.2/debian/changelog	2016-07-21 21:29:15.000000000 +0000
+++ update-manager-16.10.3/debian/changelog	2016-07-27 18:14:58.000000000 +0000
@@ -1,3 +1,11 @@
+update-manager (1:16.10.3) yakkety; urgency=medium
+
+  [Nicolas Delvaux]
+  * Attempt to retrieve Changelogs from PPA sources (LP: #253119)
+  * Correctly detect the usage of a username in changelog URIs
+
+ -- Brian Murray <brian@ubuntu.com>  Wed, 27 Jul 2016 11:14:53 -0700
+
 update-manager (1:16.10.2) yakkety; urgency=medium
 
   * Include HWE support tools and information. (LP: #1498059)
diff -Nru update-manager-16.10.2/debian/control update-manager-16.10.3/debian/control
--- update-manager-16.10.2/debian/control	2016-07-21 21:27:22.000000000 +0000
+++ update-manager-16.10.3/debian/control	2016-07-27 17:36:23.000000000 +0000
@@ -42,6 +42,7 @@
          ${misc:Depends},
          python3-apt (>= 0.8.5~),
          python3-distupgrade,
+         python3-launchpadlib,
          lsb-release
 Description: python 3.x module for update-manager
  Python module for update-manager (UpdateManager).
diff -Nru update-manager-16.10.2/UpdateManager/Core/MyCache.py update-manager-16.10.3/UpdateManager/Core/MyCache.py
--- update-manager-16.10.2/UpdateManager/Core/MyCache.py	2014-08-05 22:45:20.000000000 +0000
+++ update-manager-16.10.3/UpdateManager/Core/MyCache.py	2016-07-27 17:36:23.000000000 +0000
@@ -43,6 +43,7 @@
 import re
 import DistUpgrade.DistUpgradeCache
 from gettext import gettext as _
+from launchpadlib.launchpad import Launchpad
 
 SYNAPTIC_PINFILE = "/var/lib/synaptic/preferences"
 CHANGELOGS_POOL = "http://changelogs.ubuntu.com/changelogs/pool/"
@@ -79,6 +80,7 @@
             self.saveDistUpgrade()
         assert (self._depcache.broken_count == 0 and
                 self._depcache.del_count == 0)
+        self.launchpad = None
 
     def _dpkgJournalDirty(self):
         """
@@ -222,7 +224,7 @@
         # and so its possible to do a man-in-the-middle attack to steal the
         # credentials
         res = urlsplit(uri)
-        if res.scheme == "https" and res.username != "":
+        if res.scheme == "https" and res.username:
             raise HttpsChangelogsUnsupportedError(
                 "https locations with username/password are not"
                 "supported to fetch changelogs")
@@ -268,6 +270,48 @@
             alllines = alllines + line
         return alllines
 
+    def _extract_ppa_changelog_uri(self, name):
+        """Return the changelog URI from the Launchpad API
+
+        Return None in case of an error.
+        """
+        cdt = self[name].candidate
+        for uri in cdt.uris:
+            if urlsplit(uri).hostname != 'ppa.launchpad.net':
+                continue
+            match = re.search('http.*/(.*)/(.*)/ubuntu/.*', uri)
+            if match is not None:
+                user, ppa = match.group(1), match.group(2)
+                break
+        else:
+            logging.error("Unable to find a valid PPA candidate URL.")
+            return
+
+        # Login on launchpad if we are not already
+        if self.launchpad is None:
+            self.launchpad = Launchpad.login_anonymously('update-manager',
+                                                         'production',
+                                                         version='devel')
+
+
+        archive = self.launchpad.archives.getByReference(
+            reference='~%s/ubuntu/%s' % (user, ppa)
+        )
+        if archive is None:
+            logging.error("Unable to retrieve the archive from the Launchpad "
+                          "API.")
+            return
+
+        spphs = archive.getPublishedSources(source_name=cdt.source_name,
+                                            exact_match=True,
+                                            version=cdt.version)
+        if not spphs:
+            logging.error("No published sources were retrieved from the "
+                          "Launchpad API.")
+            return
+
+        return spphs[0].changelogUrl()
+
     def _guess_third_party_changelogs_uri_by_source(self, name):
         pkg = self[name]
         deb_uri = pkg.candidate.uri
@@ -314,14 +358,25 @@
         if news:
             self.all_news[name] = news
 
-    def _fetch_changelog_for_third_party_package(self, name):
+    def _fetch_changelog_for_third_party_package(self, name, origins):
+        # Special case for PPAs
+        changelogs_uri_ppa = None
+        for origin in origins:
+            if origin.origin.startswith('LP-PPA-'):
+                try:
+                    changelogs_uri_ppa = self._extract_ppa_changelog_uri(name)
+                    break
+                except Exception:
+                    logging.exception("Unable to connect to the Launchpad API.")
         # Try non official changelog location
         changelogs_uri_binary = \
             self._guess_third_party_changelogs_uri_by_binary(name)
         changelogs_uri_source = \
             self._guess_third_party_changelogs_uri_by_source(name)
         error_message = ""
-        for changelogs_uri in [changelogs_uri_binary, changelogs_uri_source]:
+        for changelogs_uri in [changelogs_uri_ppa,
+                               changelogs_uri_binary,
+                               changelogs_uri_source]:
             if changelogs_uri:
                 try:
                     changelog = self._get_changelog_or_news(
@@ -349,7 +404,7 @@
             (name, getattr(self[name].installed, "version", None),
              self[name].candidate.version)
         if self.CHANGELOG_ORIGIN not in [o.origin for o in origins]:
-            self._fetch_changelog_for_third_party_package(name)
+            self._fetch_changelog_for_third_party_package(name, origins)
             return
         # fixup epoch handling version
         srcpkg = self[name].candidate.source_name