diff -Nru PackageKit-0.8.7.orig/backends/smart/smartBackend.py PackageKit-0.8.7/backends/smart/smartBackend.py
--- PackageKit-0.8.7.orig/backends/smart/smartBackend.py	2013-03-06 15:22:47.965497048 +0100
+++ PackageKit-0.8.7/backends/smart/smartBackend.py	2013-03-06 19:34:16.385058826 +0100
@@ -172,9 +172,6 @@
 
     @needs_cache
     def install_packages(self, transaction_flags, packageids):
-        if TRANSACTION_FLAG_ONLY_TRUSTED in transaction_flags:
-            self.error(ERROR_MISSING_GPG_SIGNATURE, "Trusted packages not available.")
-            return
         packages = []
         for packageid in packageids:
             ratio, results, suggestions = self._search_packageid(packageid)
@@ -211,9 +208,6 @@
 
     @needs_cache
     def install_files(self, transaction_flags, paths):
-        if TRANSACTION_FLAG_ONLY_TRUSTED in transaction_flags:
-            self.error(ERROR_MISSING_GPG_SIGNATURE, "Trusted packages not available.")
-            return
         for path in paths:
             self.ctrl.addFileChannel(path)
         self.ctrl.reloadChannels()
@@ -280,9 +274,6 @@
 
     @needs_cache
     def update_packages(self, transaction_flags, packageids):
-        if TRANSACTION_FLAG_ONLY_TRUSTED in transaction_flags:
-            self.error(ERROR_MISSING_GPG_SIGNATURE, "Trusted packages not available.")
-            return
         packages = []
         for packageid in packageids:
             ratio, results, suggestions = self._search_packageid(packageid)
@@ -292,13 +283,13 @@
                            'Package %s was not found' % packagestring)
             packages.extend(self._process_search_results(results))
 
-        installed = [package for package in packages if package.installed]
+        installed = [package for package in packages]
         if len(installed) < 1:
             return
         trans = smart.transaction.Transaction(self.ctrl.getCache(),
                 smart.transaction.PolicyUpgrade)
         for package in installed:
-            trans.enqueue(package, smart.transaction.UPGRADE)
+            trans.enqueue(package, smart.transaction.INSTALL)
 
         self.allow_cancel(False)
         self.status(STATUS_DEP_RESOLVE)
@@ -334,9 +325,6 @@
 
     @needs_cache
     def update_system(self, transaction_flags):
-        if TRANSACTION_FLAG_ONLY_TRUSTED in transaction_flags:
-            self.error(ERROR_MISSING_GPG_SIGNATURE, "Trusted packages not available.")
-            return
         self.status(STATUS_INFO)
         cache = self.ctrl.getCache()