diff -Nru unattended-upgrades-0.90ubuntu0.8/debian/changelog unattended-upgrades-0.90ubuntu0.9/debian/changelog
--- unattended-upgrades-0.90ubuntu0.8/debian/changelog	2017-09-18 20:36:57.000000000 +0000
+++ unattended-upgrades-0.90ubuntu0.9/debian/changelog	2017-12-19 22:51:05.000000000 +0000
@@ -1,3 +1,9 @@
+unattended-upgrades (0.90ubuntu0.9) xenial; urgency=medium
+
+  * unattended-upgrade: Do not reboot during a dry-run. (LP: #1269177)
+
+ -- Brian Murray <brian@ubuntu.com>  Tue, 19 Dec 2017 14:51:05 -0800
+
 unattended-upgrades (0.90ubuntu0.8) xenial; urgency=medium
 
   * Do not mark packages for deletion / autoremoval if unattended-upgrades is
diff -Nru unattended-upgrades-0.90ubuntu0.8/test/unattended_upgrade.py unattended-upgrades-0.90ubuntu0.9/test/unattended_upgrade.py
--- unattended-upgrades-0.90ubuntu0.8/test/unattended_upgrade.py	2017-09-18 20:36:57.000000000 +0000
+++ unattended-upgrades-0.90ubuntu0.9/test/unattended_upgrade.py	2017-12-19 22:50:59.000000000 +0000
@@ -1338,7 +1338,9 @@
         write_stamp_file()
         # check if we couldn't reboot on previous run because
         # a user was logged-in at this time
-        reboot_if_requested_and_needed()
+        # never reboot during a dry run
+        if not options.dry_run:
+            reboot_if_requested_and_needed()
         return
 
     # check if its configured for install on shutdown, if so, the
diff -Nru unattended-upgrades-0.90ubuntu0.8/unattended-upgrade unattended-upgrades-0.90ubuntu0.9/unattended-upgrade
--- unattended-upgrades-0.90ubuntu0.8/unattended-upgrade	2017-09-18 20:36:57.000000000 +0000
+++ unattended-upgrades-0.90ubuntu0.9/unattended-upgrade	2017-12-19 22:50:59.000000000 +0000
@@ -1338,7 +1338,9 @@
         write_stamp_file()
         # check if we couldn't reboot on previous run because
         # a user was logged-in at this time
-        reboot_if_requested_and_needed()
+        # never reboot during a dry run
+        if not options.dry_run:
+            reboot_if_requested_and_needed()
         return
 
     # check if its configured for install on shutdown, if so, the