diff -Nru livecd-rootfs-2.525.18/debian/changelog livecd-rootfs-2.525.19/debian/changelog
--- livecd-rootfs-2.525.18/debian/changelog	2019-02-12 18:35:48.000000000 +0000
+++ livecd-rootfs-2.525.19/debian/changelog	2019-02-18 16:03:46.000000000 +0000
@@ -1,3 +1,10 @@
+livecd-rootfs (2.525.19) bionic; urgency=medium
+
+  * Make sure buildd images have a /usr/sbin/policy-rc.d symlink
+    (LP: #1815251).
+
+ -- Colin Watson <cjwatson@ubuntu.com>  Mon, 18 Feb 2019 16:03:46 +0000
+
 livecd-rootfs (2.525.18) bionic; urgency=medium
 
   [ Michael Hudson-Doyle ]
@@ -23,11 +30,11 @@
 
 livecd-rootfs (2.525.17) bionic; urgency=medium
 
-  * Add a buildd subproject.
+  * Add a buildd subproject (LP: #1815251).
   * Add a LXD image to builds for the buildd subproject.
   * Move buildd image building to binary hooks.
 
- -- Colin Watson <cjwatson@ubuntu.com>  Tue, 05 Feb 2019 14:55:06 +0000
+ -- Colin Watson <cjwatson@ubuntu.com>  Fri, 08 Feb 2019 22:57:59 +0000
 
 livecd-rootfs (2.525.16) bionic; urgency=medium
 
diff -Nru livecd-rootfs-2.525.18/live-build/buildd/hooks/01-policy-rc-d.binary livecd-rootfs-2.525.19/live-build/buildd/hooks/01-policy-rc-d.binary
--- livecd-rootfs-2.525.18/live-build/buildd/hooks/01-policy-rc-d.binary	1970-01-01 00:00:00.000000000 +0000
+++ livecd-rootfs-2.525.19/live-build/buildd/hooks/01-policy-rc-d.binary	2019-02-18 16:03:46.000000000 +0000
@@ -0,0 +1,13 @@
+#! /bin/sh
+set -e
+
+# Put the /usr/sbin/policy-rc.d alternatives symlink in place.  Ordinarily
+# update-alternatives ought to create this when policyrcd-script-zg2 is
+# installed, but that doesn't work because live-build has already installed
+# a dummy one at that point.  The simplest approach is to repair the
+# situation by putting it in place here.
+if [ -L binary/etc/alternatives/policy-rc.d ] && \
+   [ ! -e binary/usr/sbin/policy-rc.d ] && \
+   [ ! -L binary/usr/sbin/policy-rc.d ]; then
+	ln -s /etc/alternatives/policy-rc.d binary/usr/sbin/policy-rc.d
+fi