Index: debian/univention-system-setup.install
===================================================================
--- debian/univention-system-setup.install	(Revision 56006)
+++ debian/univention-system-setup.install	(Arbeitskopie)
@@ -2,3 +2,4 @@
 usr/lib/univention-system-setup/scripts
 usr/lib/univention-system-setup/cleanup-post.d
 usr/lib/univention-system-setup/cleanup-pre.d
+usr/lib/univention-system-setup/appliance-hooks.d
Index: debian/univention-system-setup-boot.install
===================================================================
--- debian/univention-system-setup-boot.install	(Revision 56006)
+++ debian/univention-system-setup-boot.install	(Arbeitskopie)
@@ -1,6 +1,5 @@
 usr/share/univention-system-setup/startxwithfirefox
 usr/share/univention-system-setup/download-packages
-usr/lib/univention-system-setup/appliance-hooks.d
 etc/init.d
 usr/lib/univention-system-setup/addons
 var/www
Index: debian/univention-system-setup-boot.postinst
===================================================================
--- debian/univention-system-setup-boot.postinst	(Revision 56006)
+++ debian/univention-system-setup-boot.postinst	(Arbeitskopie)
@@ -83,4 +83,15 @@
 update-rc.d -f urandom remove
 rm /var/lib/urandom/random-seed
 
+# generate package removal appliance hook
+cat >/usr/lib/univention-system-setup/appliance-hooks.d/95_remove_package_cache <<__EOF__
+#!/bin/sh
+if [ -s /var/cache/univention-system-setup/profile ]; then
+	rm -f /var/cache/univention-system-setup/packages/*.deb
+	rm -f /var/cache/univention-system-setup/packages/Packages
+	rm -f /etc/apt/sources.list.d/05univention-system-setup.list
+fi
+__EOF__
+chmod 755 /usr/lib/univention-system-setup/appliance-hooks.d/95_remove_package_cache
+
 exit 0
Index: debian/univention-system-setup-boot.postrm
===================================================================
--- debian/univention-system-setup-boot.postrm	(Revision 56006)
+++ debian/univention-system-setup-boot.postrm	(Arbeitskopie)
@@ -54,10 +54,4 @@
 
 #DEBHELPER#
 
-if [ "$1" = remove -o "$1" = purge ]; then
-	rm -f /var/cache/univention-system-setup/packages/*.deb
-	rm -f /var/cache/univention-system-setup/packages/Packages
-	rm -f /etc/apt/sources.list.d/05univention-system-setup.list
-fi
-
 exit 0
Index: debian/univention-system-setup.postinst
===================================================================
--- debian/univention-system-setup.postinst	(Revision 56006)
+++ debian/univention-system-setup.postinst	(Arbeitskopie)
@@ -37,4 +37,8 @@
 
 chmod -R 700 /var/cache/univention-system-setup
 
+if dpkg --compare-versions "$2" lt-nl "8.1.64-1" && [ ! -e /var/univention-join/joined ]; then
+	ucr unset --force update/available
+fi
+
 exit 0