diff -Nru dpkg-1.17.5ubuntu5.7/debian/changelog dpkg-1.17.5ubuntu5.8/debian/changelog
--- dpkg-1.17.5ubuntu5.7/debian/changelog	2016-06-14 20:31:28.000000000 +0200
+++ dpkg-1.17.5ubuntu5.8/debian/changelog	2017-03-17 08:50:40.000000000 +0100
@@ -1,3 +1,12 @@
+dpkg (1.17.5ubuntu5.8) trusty; urgency=medium
+
+  * src/archives.c:
+    - handle a conffile moving from pkg-a to pkg-b correctly when
+      dpkg --root=/dir is used. Thanks to Guillem Jover.
+      LP: #1673247
+
+ -- Michael Vogt <michael.vogt@ubuntu.com>  Fri, 17 Mar 2017 08:50:40 +0100
+
 dpkg (1.17.5ubuntu5.7) trusty; urgency=medium
 
   * Backport from Debian (LP: #1587667):
diff -Nru dpkg-1.17.5ubuntu5.7/.mailmap dpkg-1.17.5ubuntu5.8/.mailmap
--- dpkg-1.17.5ubuntu5.7/.mailmap	2013-10-20 05:53:23.000000000 +0200
+++ dpkg-1.17.5ubuntu5.8/.mailmap	1970-01-01 01:00:00.000000000 +0100
@@ -1,26 +0,0 @@
-# Spell names properly
-Raphaël Hertzog <hertzog@debian.org>
-Nicolas François <nekral-guest@users.alioth.debian.org>
-Javier Fernández-Sanguino Peña <jfs@debian.org> <jfs@javifsp.no-ip.org>
-Javier Fernández-Sanguino Peña <jfs@debian.org>
-Eddy Petrișor <eddyp-guest@users.alioth.debian.org>
-Jiří Paleček <jpalecek@web.de>
-# Use full names
-Felipe E. F. de Castro <fefcas@gmail.com>
-Marcos Alvarez Costales <marcos.alvarez.costales@gmail.com>
-Kenshi Muto <kmuto@debian.org>
-# Handle alias disparity
-Felipe Augusto van de Wiel <faw@debian.org>
-Daniel Nylander <po@danielnylander.se> <yeager-guest@users.alioth.debian.org>
-Bart Cornelis <cobaco@skolelinux.no> <cobaco-guest@users.alioth.debian.org>
-Bart Cornelis <cobaco@skolelinux.no>
-Andrei Popescu <andreimpopescu@gmail.com>
-Christian Perrier <bubulle@debian.org>
-# Name changes
-Peter Krefting <peter@softwolves.pp.se> <peter@svarten.intern.softwolves.pp.se>
-Peter Krefting <peter@softwolves.pp.se>
-Peter Krefting <peterk@debian.org>
-# Use real mail addresses
-<elmig@debianpt.org> <elmig@dv2585ep.(none)>
-<elmig@debianpt.org> <elmig@eeepc.debian>
-<robert@debian.org> <robert@vox.robbo.home>
diff -Nru dpkg-1.17.5ubuntu5.7/src/archives.c dpkg-1.17.5ubuntu5.8/src/archives.c
--- dpkg-1.17.5ubuntu5.7/src/archives.c	2013-12-10 07:15:02.000000000 +0100
+++ dpkg-1.17.5ubuntu5.8/src/archives.c	2017-03-17 08:50:23.000000000 +0100
@@ -971,14 +971,7 @@
              conff = conff->next) {
           if (!conff->obsolete)
             continue;
-          if (stat(conff->name, &stabtmp)) {
-            if (errno == ENOENT || errno == ENOTDIR || errno == ELOOP)
-              continue;
-            else
-              ohshite(_("cannot stat file '%s'"), conff->name);
-          }
-          if (stabtmp.st_dev == stab.st_dev &&
-              stabtmp.st_ino == stab.st_ino)
+          if (strcmp(conff->name, nifd->namenode->name) == 0)
             break;
         }
         if (conff) {