/usr/ is in ruby-sequel-pg 1.6.8-1.
This file is owned by root:root, with mode 0o755.
..
/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/2.0.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/sequel_pg.so
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/1.9.1/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/sequel_pg.so
/usr/lib/ruby/vendor_ruby/sequel/
/usr/lib/ruby/vendor_ruby/sequel/extensions/
/usr/lib/ruby/vendor_ruby/sequel/extensions/pg_streaming.rb
/usr/lib/ruby/vendor_ruby/sequel_pg/
/usr/lib/ruby/vendor_ruby/sequel_pg/sequel_pg.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/sequel_pg-1.6.8.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/sequel_pg-1.6.8.gemspec
/usr/share/doc/
/usr/share/doc/ruby-sequel-pg/
/usr/share/doc/ruby-sequel-pg/copyright
/usr/share/doc/ruby-sequel-pg/README.rdoc.gz
/usr/share/doc/ruby-sequel-pg/changelog.Debian.gz