diff --git a/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst b/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst
index feb0937d5..35bf74c2d 100644
--- a/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst
+++ b/xCAT-nbroot2/debian/xcat-genesis-amd64.postinst
@@ -20,13 +20,13 @@ set -e
 
 case "$1" in
     configure)
-    ;;
-
-    upgrade)
+      if [ -f /tmp/xCAT-genesis_upgrade.tmp ];then
         if [ -f "/proc/cmdline" ]; then   # prevent running it during install into chroot image
 	    . /etc/profile.d/xcat.sh
 	    mknb x86_64
 	fi
+        rm /tmp/xCAT-genesis_upgrade.tmp
+      fi
     ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)
diff --git a/xCAT-nbroot2/debian/xcat-genesis-amd64.prerm b/xCAT-nbroot2/debian/xcat-genesis-amd64.prerm
new file mode 100644
index 000000000..155110d63
--- /dev/null
+++ b/xCAT-nbroot2/debian/xcat-genesis-amd64.prerm
@@ -0,0 +1,41 @@
+#!/bin/sh
+# prerm script for xCAT-nbroot2
+#
+# see: dh_installdeb(1)
+
+set -e
+
+# summary of how this script can be called:
+#        * <prerm> `remove'
+#        * <old-prerm> `upgrade' <new-version>
+#        * <new-prerm> `failed-upgrade' <old-version>
+#        * <conflictor's-prerm> `remove' `in-favour' <package> <new-version>
+#        * <deconfigured's-prerm> `deconfigure' `in-favour'
+#          <package-being-installed> <version> `removing'
+#          <conflicting-package> <version>
+# for details, see http://www.debian.org/doc/debian-policy/ or
+# the debian-policy package
+
+
+case "$1" in
+    upgrade)
+	touch /tmp/xCAT-genesis_upgrade.tmp
+    ;;
+    remove|deconfigure)
+    ;;
+
+    failed-upgrade)
+    ;;
+
+    *)
+        echo "prerm called with unknown argument \`$1'" >&2
+        exit 1
+    ;;
+esac
+
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
+#DEBHELPER#
+
+exit 0