/usr/ is in icinga2-ido-pgsql 2.4.1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/icinga2/
/usr/lib/x86_64-linux-gnu/icinga2/libdb_ido_pgsql.so
/usr/share/
/usr/share/icinga2-ido-pgsql/
/usr/share/icinga2-ido-pgsql/schema/
/usr/share/icinga2-ido-pgsql/schema/pgsql.sql
/usr/share/icinga2-ido-pgsql/schema/upgrade/
/usr/share/icinga2-ido-pgsql/schema/upgrade/2.4.0.sql
/usr/share/icinga2-ido-pgsql/schema/upgrade/2.1.0.sql
/usr/share/icinga2-ido-pgsql/schema/upgrade/2.0.2.sql
/usr/share/icinga2-ido-pgsql/schema/upgrade/2.2.0.sql
/usr/share/icinga2-ido-pgsql/schema/upgrade/2.3.0.sql
/usr/share/icinga2/
/usr/share/icinga2/tmpl/
/usr/share/icinga2/tmpl/ido-pgsql.conf-sample
/usr/share/doc/
/usr/share/doc/icinga2-ido-pgsql/
/usr/share/doc/icinga2-ido-pgsql/copyright
/usr/share/dbconfig-common/
/usr/share/dbconfig-common/data/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.3.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.1.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.2.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.4.0
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/upgrade/pgsql/2.0.2
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/install/
/usr/share/dbconfig-common/data/icinga2-ido-pgsql/install/pgsql
/usr/share/doc/icinga2-ido-pgsql/changelog.Debian.gz