diff -Nru vlock-2.2.2/debian/changelog vlock-2.2.2/debian/changelog
--- vlock-2.2.2/debian/changelog	2016-09-18 12:24:09.000000000 +0000
+++ vlock-2.2.2/debian/changelog	2016-09-20 16:41:18.000000000 +0000
@@ -1,3 +1,11 @@
+vlock (2.2.2-8) unstable; urgency=medium
+
+  * QA upload.
+  * Remove 2.2.2-6's postrm. Thanks to Jakub Wilk for spotting the fatal
+    error. (Closes: #838351)
+
+ -- Helmut Grohne <helmut@subdivi.de>  Tue, 20 Sep 2016 18:41:17 +0200
+
 vlock (2.2.2-7) unstable; urgency=medium
 
   * QA upload.
diff -Nru vlock-2.2.2/debian/vlock.preinst vlock-2.2.2/debian/vlock.preinst
--- vlock-2.2.2/debian/vlock.preinst	1970-01-01 00:00:00.000000000 +0000
+++ vlock-2.2.2/debian/vlock.preinst	2016-09-20 16:34:47.000000000 +0000
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+if test "$1" = upgrade -a "$2" = 2.2.2-6; then
+	# broken postrm removes vlock group during upgrade #838351
+	rm -f ${DPKG_ROOT:-}/var/lib/dpkg/info/vlock.postrm
+fi
+
+#DEBHELPER#