/usr/ is in postgresql-pltcl-9.5 9.5.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/postgresql/
/usr/lib/postgresql/9.5/
/usr/lib/postgresql/9.5/bin/
/usr/lib/postgresql/9.5/bin/pltcl_loadmod
/usr/lib/postgresql/9.5/bin/pltcl_listmod
/usr/lib/postgresql/9.5/bin/pltcl_delmod
/usr/lib/postgresql/9.5/lib/
/usr/lib/postgresql/9.5/lib/pltcl.so
/usr/share/
/usr/share/postgresql/
/usr/share/postgresql/9.5/
/usr/share/postgresql/9.5/unknown.pltcl
/usr/share/postgresql/9.5/extension/
/usr/share/postgresql/9.5/extension/pltcl--unpackaged--1.0.sql
/usr/share/postgresql/9.5/extension/pltclu--1.0.sql
/usr/share/postgresql/9.5/extension/pltclu--unpackaged--1.0.sql
/usr/share/postgresql/9.5/extension/pltclu.control
/usr/share/postgresql/9.5/extension/pltcl--1.0.sql
/usr/share/postgresql/9.5/extension/pltcl.control
/usr/share/doc/
/usr/share/doc/postgresql-pltcl-9.5/
/usr/share/doc/postgresql-pltcl-9.5/copyright
/usr/share/doc/postgresql-pltcl-9.5/changelog.Debian.gz