diff -u nux-4.0.8+18.04.20180613.5/debian/changelog nux-4.0.8+18.04.20180613.5/debian/changelog
--- nux-4.0.8+18.04.20180613.5/debian/changelog
+++ nux-4.0.8+18.04.20180613.5/debian/changelog
@@ -1,3 +1,11 @@
+nux (4.0.8+18.04.20180613.5-0ubuntu2) UNRELEASED; urgency=medium
+
+  * debian/nux-tools.preinst: If we find an Xsession.d file saved away by
+    mesa, put it back before unpacking. This is so we can restore any user
+    modifications.
+
+ -- Iain Lane <iain@orangesquash.org.uk>  Thu, 14 Jun 2018 09:33:22 +0100
+
 nux (4.0.8+18.04.20180613.5-0ubuntu1) bionic; urgency=medium
 
   * debian/50_check_unity_support:
only in patch2:
unchanged:
--- nux-4.0.8+18.04.20180613.5.orig/debian/nux-tools.preinst
+++ nux-4.0.8+18.04.20180613.5/debian/nux-tools.preinst
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -e
+
+# install from config-files state, previously buggy version
+# use the first fixed version here
+if [ "$1" = install ] &&
+   dpkg --compare-versions "$2" lt-nl 4.0.8+18.04.20180613.5-0ubuntu2 &&
+   [ -e /etc/X11/Xsession.d/50_check_unity_support.mesa-save ]; then
+        echo "Found saved /etc/X11/Xsession.d/50_check_unity_support.mesa-save file, moving it back in place..."
+        mv /etc/X11/Xsession.d/50_check_unity_support.mesa-save /etc/X11/Xsession.d/50_check_unity_support
+fi
+
+#DEBHELPER#