/usr/lib/ruby/vendor_ruby/nokogiri/ is in ruby-nokogiri 1.6.8.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/nokogiri/css/
/usr/lib/ruby/vendor_ruby/nokogiri/css.rb
/usr/lib/ruby/vendor_ruby/nokogiri/css/node.rb
/usr/lib/ruby/vendor_ruby/nokogiri/css/parser.rb
/usr/lib/ruby/vendor_ruby/nokogiri/css/parser.y
/usr/lib/ruby/vendor_ruby/nokogiri/css/parser_extras.rb
/usr/lib/ruby/vendor_ruby/nokogiri/css/syntax_error.rb
/usr/lib/ruby/vendor_ruby/nokogiri/css/tokenizer.rb
/usr/lib/ruby/vendor_ruby/nokogiri/css/tokenizer.rex
/usr/lib/ruby/vendor_ruby/nokogiri/css/xpath_visitor.rb
/usr/lib/ruby/vendor_ruby/nokogiri/decorators/
/usr/lib/ruby/vendor_ruby/nokogiri/decorators/slop.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/
/usr/lib/ruby/vendor_ruby/nokogiri/html.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/builder.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/document.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/document_fragment.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/element_description.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/element_description_defaults.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/entity_lookup.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/sax/
/usr/lib/ruby/vendor_ruby/nokogiri/html/sax/parser.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/sax/parser_context.rb
/usr/lib/ruby/vendor_ruby/nokogiri/html/sax/push_parser.rb
/usr/lib/ruby/vendor_ruby/nokogiri/syntax_error.rb
/usr/lib/ruby/vendor_ruby/nokogiri/version.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/
/usr/lib/ruby/vendor_ruby/nokogiri/xml.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/attr.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/attribute_decl.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/builder.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/cdata.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/character_data.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/document.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/document_fragment.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/dtd.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/element_content.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/element_decl.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/entity_decl.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/namespace.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/node/
/usr/lib/ruby/vendor_ruby/nokogiri/xml/node.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/node/save_options.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/node_set.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/notation.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/parse_options.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/pp/
/usr/lib/ruby/vendor_ruby/nokogiri/xml/pp.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/pp/character_data.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/pp/node.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/processing_instruction.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/reader.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/relax_ng.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/sax/
/usr/lib/ruby/vendor_ruby/nokogiri/xml/sax.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/sax/document.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/sax/parser.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/sax/parser_context.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/sax/push_parser.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/schema.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/searchable.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/syntax_error.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/text.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/xpath/
/usr/lib/ruby/vendor_ruby/nokogiri/xml/xpath.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/xpath/syntax_error.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xml/xpath_context.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xslt/
/usr/lib/ruby/vendor_ruby/nokogiri/xslt.rb
/usr/lib/ruby/vendor_ruby/nokogiri/xslt/stylesheet.rb