UBUNTU: Ubuntu-4.4.0-57.78

Signed-off-by: Brad Figg <brad.figg@canonical.com>

debian.master/changelog

-linux (4.4.0-57.78) UNRELEASED; urgency=low
+linux (4.4.0-57.78) xenial; urgency=low
 
-  CHANGELOG: Do not edit directly. Autogenerated at release.
-  CHANGELOG: Use the printchanges target to see the curent changes.
-  CHANGELOG: Use the insertchanges target to create the final log.
+  * Release Tracking Bug
+    - LP: #1648867
+
+  * Miscellaneous Ubuntu changes
+    - SAUCE: Do not build the xr-usb-serial driver for s390
 
  -- Brad Figg <brad.figg@canonical.com>  Fri, 09 Dec 2016 10:51:16 -0800
 
 linux (4.4.0-56.77) xenial; urgency=low
 
+  * Release Tracking Bug
+    - LP: #1648867
+
   * Release Tracking Bug
     - LP: #1648579