If I say rpm -U xxx.new.rpm rpm will first run the "%post" script of the new rpm before the "%preun" script of the old rpm. This seems to be nonsense to me. It should first do rpm -e xxx.old.rpm and then rpm -i xxx.new.rpm Gerald
This has been the behavior of rpm for A Long Time Now. See the complete order of scriptlet execution in /usr/doc/rpm-*/triggers.