Install libapache2-mod-auth-pgsql by entering the following commands in the terminal:
sudo apt update sudo apt install libapache2-mod-auth-pgsql
Description:
Module for Apache2 which provides PostgreSQL authentication
mod_auth_pgsql implements authentication and logging routines using PostgreSQL tables for Apache's authentication protocol.
Homepage: http://www.giuseppetanzilli.it/mod_auth_pgsql2
Version: 2.0.3-6.1ubuntu1
Section: httpd