postgresql-all 9.6+184ubuntu1 (amd64 binary) in ubuntu bionic

 This metapackage depends on all PostgreSQL server packages, in all
 supported versions (excluding documentation and debug symbols). It
 exists to facilitate depending on the server packages in test
 environments.
 .
 PostgreSQL is a fully featured object-relational database management
 system. It supports a large part of the SQL standard and is designed
 to be extensible by users in many aspects. Some of the features are:
 ACID transactions, foreign keys, views, sequences, subqueries,
 triggers, user-defined types and functions, outer joins, multiversion
 concurrency control. Graphical user interfaces and bindings for many
 programming languages are available as well.