pg_fprintf not found on the installed version of postgres, breaking existing application root@data:~# dpkg -l | grep postgres ii postgresql-12 12.12-0ubuntu0.20.04.1 amd64 object-relational SQL database, version 12 server ii postgresql-client-12 12.12-0ubuntu0.20.04.1 amd64 front-end programs for PostgreSQL 12 ii postgresql-client-common 238 all manager for multiple PostgreSQL client versions ii postgresql-common 238 all PostgreSQL database-cluster manager ii postgresql-doc-12 12.12-0ubuntu0.20.04.1 all documentation for the PostgreSQL database management system ii postgresql-server-dev-12 12.12-0ubuntu0.20.04.1 root@data:~# dpkg -l | grep libpq ii libpq-dev 12.12-0ubuntu0.20.04.1 amd64 header files for libpq5 (PostgreSQL library) ii libpq5:amd64 12.12-0ubuntu0.20.04.1