inst=/etc/menu-methods/#PACKAGE#
-if [ "$1" = "remove" -a -f "$inst" ]; then chmod a-x $inst ; fi
-if [ -x /usr/bin/update-menus ]; then update-menus; fi
+if [ "$1" = "remove" ] && [ -f "$inst" ]; then chmod a-x $inst ; fi
+if [ -x "`which update-menus 2>/dev/null`" ]; then update-menus ; fi