I followed the guide https://help.univention.com/t/updating-from-postgresql-9-4-to-postgresql-9-6/8075 after the update from 4.2 to 4.3.
univention-upgrade seems to bring back postgresql 9.4 (on master and backup, not slave, member).
The following packages will be upgraded: postgresql-client-9.4,postgresql-9.4
Is this necessary? Is it due to the missing purge of postgresql-client in the tutorial?