Index: unattended-upgrades-0.82.1ubuntu2.2/unattended-upgrade
===================================================================
--- unattended-upgrades-0.82.1ubuntu2.2.orig/unattended-upgrade	2015-03-06 00:12:00.000000000 +0100
+++ unattended-upgrades-0.82.1ubuntu2.2/unattended-upgrade	2015-04-16 12:36:45.137424552 +0200
@@ -99,7 +99,7 @@
         """
         for pkg in self:
             # important! this avoids downgrades below
-            if not pkg.is_upgradable:
+            if pkg.is_installed and not pkg.is_upgradable:
                 continue
             # check if the candidate is already pointing to a allowed
             # origin and if so, do not mess with it