/usr/share/ is in postgresql-9.3-postgis-scripts 2.1.2+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/postgresql/
/usr/share/postgresql/9.3/
/usr/share/postgresql/9.3/contrib/
/usr/share/postgresql/9.3/contrib/postgis-2.1/
/usr/share/postgresql/9.3/contrib/postgis-2.1/topology_comments.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/legacy_minimal.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/raster_comments.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/uninstall_topology.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/topology_upgrade_21_minor.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/postgis_restore.pl
/usr/share/postgresql/9.3/contrib/postgis-2.1/uninstall_legacy.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/rtpostgis_upgrade_20_21.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/uninstall_postgis.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/uninstall_sfcgal.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/rtpostgis.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/uninstall_rtpostgis.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/postgis_upgrade_20_21.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/postgis_upgrade_21_minor.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/legacy.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/spatial_ref_sys.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/rtpostgis_upgrade_21_minor.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/legacy_gist.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/postgis.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/topology.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/postgis_comments.sql
/usr/share/postgresql/9.3/contrib/postgis-2.1/rtpostgis_legacy.sql
/usr/share/postgresql/9.3/extension/
/usr/share/postgresql/9.3/extension/postgis_topology--2.1.2next--2.1.2.sql
/usr/share/postgresql/9.3/extension/postgis--2.1.2--2.1.2next.sql
/usr/share/postgresql/9.3/extension/postgis--2.0.2--2.1.2.sql
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/usr/share/postgresql/9.3/extension/postgis_topology--2.1.0rc1--2.1.2.sql
/usr/share/postgresql/9.3/extension/postgis_tiger_geocoder--2.1.1--2.1.2.sql
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/usr/share/postgresql/9.3/extension/postgis--2.1.1--2.1.2.sql
/usr/share/postgresql/9.3/extension/postgis_topology--2.1.1--2.1.2.sql
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/usr/share/postgresql/9.3/extension/postgis_tiger_geocoder--2.1.2.sql
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/usr/share/postgresql/9.3/extension/postgis_topology.control
/usr/share/doc/
/usr/share/doc/postgresql-9.3-postgis-scripts/
/usr/share/doc/postgresql-9.3-postgis-scripts/copyright
/usr/share/doc/postgresql-9.3-postgis-scripts/changelog.Debian.gz