/usr/share/postgresql-common/ is in postgresql-common 173ubuntu0.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/postgresql-common/createcluster.conf
/usr/share/postgresql-common/init.d-functions
/usr/share/postgresql-common/logrotate.template
/usr/share/postgresql-common/pg_checksystem
/usr/share/postgresql-common/pgdg/
/usr/share/postgresql-common/pgdg/apt.postgresql.org.sh
/usr/share/postgresql-common/run-upgrade-scripts
/usr/share/postgresql-common/t/
/usr/share/postgresql-common/t/001_packages.t
/usr/share/postgresql-common/t/002_existing_clusters.t
/usr/share/postgresql-common/t/003_package_checks.t
/usr/share/postgresql-common/t/005_PgCommon.t
/usr/share/postgresql-common/t/006_next_free_port.t
/usr/share/postgresql-common/t/007_pg_conftool.t
/usr/share/postgresql-common/t/010_defaultport_cluster.t
/usr/share/postgresql-common/t/015_start_stop.t
/usr/share/postgresql-common/t/020_create_sql_remove.t
/usr/share/postgresql-common/t/021_pg_renamecluster.t
/usr/share/postgresql-common/t/022_recovery.t
/usr/share/postgresql-common/t/025_logging.t
/usr/share/postgresql-common/t/030_errors.t
/usr/share/postgresql-common/t/031_errors_disk_full.t
/usr/share/postgresql-common/t/032_ssl_key_permissions.t
/usr/share/postgresql-common/t/040_upgrade.t
/usr/share/postgresql-common/t/041_upgrade_custompaths.t
/usr/share/postgresql-common/t/043_upgrade_ssl_cert.t
/usr/share/postgresql-common/t/050_encodings.t
/usr/share/postgresql-common/t/051_inconsistent_encoding_upgrade.t
/usr/share/postgresql-common/t/052_upgrade_encodings.t
/usr/share/postgresql-common/t/060_obsolete_confparams.t
/usr/share/postgresql-common/t/070_non_postgres_clusters.t
/usr/share/postgresql-common/t/080_start.conf.t
/usr/share/postgresql-common/t/085_pg_ctl.conf.t
/usr/share/postgresql-common/t/090_multicluster.t
/usr/share/postgresql-common/t/100_upgrade_scripts.t
/usr/share/postgresql-common/t/110_integrate_cluster.t
/usr/share/postgresql-common/t/120_pg_upgradecluster_scripts.t
/usr/share/postgresql-common/t/130_nonroot_admin.t
/usr/share/postgresql-common/t/140_pg_config.t
/usr/share/postgresql-common/t/150_tsearch_stemming.t
/usr/share/postgresql-common/t/160_alternate_confroot.t
/usr/share/postgresql-common/t/170_extensions.t
/usr/share/postgresql-common/t/180_ecpg.t
/usr/share/postgresql-common/t/8.1.conf
/usr/share/postgresql-common/t/8.2.conf
/usr/share/postgresql-common/t/8.3.conf
/usr/share/postgresql-common/t/8.4.conf
/usr/share/postgresql-common/t/9.0.conf
/usr/share/postgresql-common/t/9.1.conf
/usr/share/postgresql-common/t/9.2.conf
/usr/share/postgresql-common/t/9.3.conf
/usr/share/postgresql-common/t/9.4.conf
/usr/share/postgresql-common/t/TestLib.pm
/usr/share/postgresql-common/t/template
/usr/share/postgresql-common/testsuite
/usr/share/postgresql-common/upgrade-scripts/
/usr/share/postgresql-common/upgrade-scripts/SPECIFICATION