/usr/lib/ruby/ is in ruby-http-cookie 1.0.1-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/http-cookie.rb
/usr/lib/ruby/vendor_ruby/http/
/usr/lib/ruby/vendor_ruby/http/cookie_jar/
/usr/lib/ruby/vendor_ruby/http/cookie_jar/cookiestxt_saver.rb
/usr/lib/ruby/vendor_ruby/http/cookie_jar/hash_store.rb
/usr/lib/ruby/vendor_ruby/http/cookie_jar/abstract_saver.rb
/usr/lib/ruby/vendor_ruby/http/cookie_jar/abstract_store.rb
/usr/lib/ruby/vendor_ruby/http/cookie_jar/yaml_saver.rb
/usr/lib/ruby/vendor_ruby/http/cookie_jar/mozilla_store.rb
/usr/lib/ruby/vendor_ruby/http/cookie.rb
/usr/lib/ruby/vendor_ruby/http/cookie/
/usr/lib/ruby/vendor_ruby/http/cookie/scanner.rb
/usr/lib/ruby/vendor_ruby/http/cookie/version.rb
/usr/lib/ruby/vendor_ruby/http/cookie/ruby_compat.rb
/usr/lib/ruby/vendor_ruby/http/cookie_jar.rb