/usr/share/postgresql/9.5/extension/ is in postgresql-9.5-pgq3 3.2.6-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/postgresql/9.5/extension/londiste--3.1--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--3.1.1--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--3.1.3--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--3.1.4--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--3.1.6--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--3.2--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--3.2.3--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste--unpackaged--3.2.4.sql
/usr/share/postgresql/9.5/extension/londiste.control
/usr/share/postgresql/9.5/extension/pgq--3.1--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--3.1.1--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--3.1.2--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--3.1.3--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--3.1.6--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--3.2--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--3.2.3--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq--unpackaged--3.2.6.sql
/usr/share/postgresql/9.5/extension/pgq.control
/usr/share/postgresql/9.5/extension/pgq_coop--3.1--3.1.1.sql
/usr/share/postgresql/9.5/extension/pgq_coop--3.1.1.sql
/usr/share/postgresql/9.5/extension/pgq_coop--unpackaged--3.1.1.sql
/usr/share/postgresql/9.5/extension/pgq_coop.control
/usr/share/postgresql/9.5/extension/pgq_ext--3.1.sql
/usr/share/postgresql/9.5/extension/pgq_ext--unpackaged--3.1.sql
/usr/share/postgresql/9.5/extension/pgq_ext.control
/usr/share/postgresql/9.5/extension/pgq_node--3.1--3.2.5.sql
/usr/share/postgresql/9.5/extension/pgq_node--3.1.3--3.2.5.sql
/usr/share/postgresql/9.5/extension/pgq_node--3.1.6--3.2.5.sql
/usr/share/postgresql/9.5/extension/pgq_node--3.2--3.2.5.sql
/usr/share/postgresql/9.5/extension/pgq_node--3.2.5.sql
/usr/share/postgresql/9.5/extension/pgq_node--unpackaged--3.2.5.sql
/usr/share/postgresql/9.5/extension/pgq_node.control