/usr/ is in ruby-akonadi 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-akonadi/
/usr/share/doc/ruby-akonadi/examples/
/usr/share/doc/ruby-akonadi/examples/akonamail/
/usr/share/doc/ruby-akonadi/examples/akonamail/mainwindow.rb
/usr/share/doc/ruby-akonadi/examples/akonamail/main.rb
/usr/share/doc/ruby-akonadi/examples/akonamail/mainwidget.rb
/usr/share/doc/ruby-akonadi/copyright
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/1.9.1/
/usr/lib/ruby/vendor_ruby/1.9.1/akonadi/
/usr/lib/ruby/vendor_ruby/1.9.1/akonadi/akonadi.rb
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/akonadi.so
/usr/share/doc/ruby-akonadi/changelog.Debian.gz