/usr/ is in ruby-dataobjects-postgres 0.10.16-1build4.
This file is owned by root:root, with mode 0o755.
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/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/do_postgres/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/do_postgres/do_postgres.so
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/do_postgres/
/usr/lib/ruby/vendor_ruby/do_postgres/version.rb
/usr/lib/ruby/vendor_ruby/do_postgres/transaction.rb
/usr/lib/ruby/vendor_ruby/do_postgres/encoding.rb
/usr/lib/ruby/vendor_ruby/do_postgres.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/2.3.0/
/usr/share/rubygems-integration/2.3.0/specifications/
/usr/share/rubygems-integration/2.3.0/specifications/do_postgres-0.10.16.gemspec
/usr/share/doc/
/usr/share/doc/ruby-dataobjects-postgres/
/usr/share/doc/ruby-dataobjects-postgres/copyright
/usr/share/doc/ruby-dataobjects-postgres/changelog.Debian.gz
/usr/share/doc/ruby-dataobjects-postgres/README.markdown
/usr/share/doc/ruby-dataobjects-postgres/TODO.Debian