diff -Nru corosync-2.4.2/debian/changelog corosync-2.4.2/debian/changelog
--- corosync-2.4.2/debian/changelog	2017-02-24 11:12:34.000000000 +0000
+++ corosync-2.4.2/debian/changelog	2018-01-31 00:40:31.000000000 +0000
@@ -1,3 +1,16 @@
+corosync (2.4.2-3ubuntu1) bionic; urgency=medium
+
+  * Properly restart corosync and pacemaker together (LP: #1740892)
+    - d/rules: pass --restart-after-upgrade to dh_installinit
+    - d/control: indicate this version breaks all older pacemaker, to
+      force an upgrade of pacemaker.
+    - d/corosync.postinst: if flagged to do so by pacemaker, start
+      pacemaker on upgrade.
+      + This can be dropped after bionic releases as long as the other
+        changes are maintained.
+
+ -- Nishanth Aravamudan <nish.aravamudan@canonical.com>  Tue, 30 Jan 2018 16:40:31 -0800
+
 corosync (2.4.2-3build1) zesty; urgency=medium
 
   * No-change rebuild against libnspr4
diff -Nru corosync-2.4.2/debian/control corosync-2.4.2/debian/control
--- corosync-2.4.2/debian/control	2016-12-18 19:11:35.000000000 +0000
+++ corosync-2.4.2/debian/control	2018-01-31 00:40:31.000000000 +0000
@@ -1,7 +1,8 @@
 Source: corosync
 Section: admin
 Priority: optional
-Maintainer: Debian HA Maintainers <debian-ha-maintainers@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian HA Maintainers <debian-ha-maintainers@lists.alioth.debian.org>
 Uploaders: Christoph Berg <myon@debian.org>,
  Richard B Winters <rik@mmogp.com>,
  Adrian Vondendriesch <adrian.vondendriesch@credativ.de>,
@@ -39,6 +40,7 @@
  lsb-base (>= 3.0-6),
  adduser,
  xsltproc
+Breaks: pacemaker (<< 1.1.18~rc4-1ubuntu1)
 Description: cluster engine daemon and utilities
  ${DESCRIPTION}
  This package contains the Corosync daemon and some administration tools.
diff -Nru corosync-2.4.2/debian/corosync.postinst corosync-2.4.2/debian/corosync.postinst
--- corosync-2.4.2/debian/corosync.postinst	2016-12-18 19:11:35.000000000 +0000
+++ corosync-2.4.2/debian/corosync.postinst	2018-01-31 00:40:31.000000000 +0000
@@ -6,6 +6,16 @@
 	echo 'This file is here to keep the log dir around after package removal
 until #588515 is fixed.' >/var/log/corosync/.empty
 	# really was empty before 2.3.5-1
+
+	# For upgrades from older corosync, look for a flag from
+	# pacemaker that it was running before upgrade. See LP: #1740892
+	if dpkg --compare-versions "$2" lt "2.4.2-3ubuntu1"; then
+		if [ -f /run/pacemaker-was-running-lp1740892-workaround ]; then
+			if deb-systemd-invoke start pacemaker >/dev/null 2>&1; then
+				rm -f /run/pacemaker-was-running-lp1740892-workaround
+			fi
+		fi
+	fi
 fi
 
 #DEBHELPER#
diff -Nru corosync-2.4.2/debian/rules corosync-2.4.2/debian/rules
--- corosync-2.4.2/debian/rules	2016-12-19 08:47:04.000000000 +0000
+++ corosync-2.4.2/debian/rules	2018-01-31 00:40:31.000000000 +0000
@@ -79,6 +79,9 @@
 override_dh_install:
 	dh_install --fail-missing
 
+override_dh_installinit:
+	dh_installinit --restart-after-upgrade
+
 override_dh_installchangelogs:
 	dh_installchangelogs ChangeLog