/usr/lib/ruby/ is in ruby-dbus 0.7.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/dbus/
/usr/lib/ruby/vendor_ruby/dbus.rb
/usr/lib/ruby/vendor_ruby/dbus/auth.rb
/usr/lib/ruby/vendor_ruby/dbus/bus.rb
/usr/lib/ruby/vendor_ruby/dbus/core_ext/
/usr/lib/ruby/vendor_ruby/dbus/core_ext/class/
/usr/lib/ruby/vendor_ruby/dbus/core_ext/class/attribute.rb
/usr/lib/ruby/vendor_ruby/dbus/core_ext/kernel/
/usr/lib/ruby/vendor_ruby/dbus/core_ext/kernel/singleton_class.rb
/usr/lib/ruby/vendor_ruby/dbus/core_ext/module/
/usr/lib/ruby/vendor_ruby/dbus/core_ext/module/remove_method.rb
/usr/lib/ruby/vendor_ruby/dbus/error.rb
/usr/lib/ruby/vendor_ruby/dbus/export.rb
/usr/lib/ruby/vendor_ruby/dbus/introspect.rb
/usr/lib/ruby/vendor_ruby/dbus/marshall.rb
/usr/lib/ruby/vendor_ruby/dbus/matchrule.rb
/usr/lib/ruby/vendor_ruby/dbus/message.rb
/usr/lib/ruby/vendor_ruby/dbus/type.rb