节点。js npm安装fs错误。

ubuntu@ip-xxx-xx-x-xxx:/var/www/html$ npm install fs
npm WARN package.json [email protected] crypto is also the name of a node core module.
npm WARN package.json [email protected] No description
npm WARN package.json [email protected] http is also the name of a node core module.
npm WARN package.json [email protected] No description
npm WARN package.json [email protected] No repository field.
npm WARN package.json [email protected] No repository field.

npm WARN package.json [email protected] querystring is also the name of a node core module.
    npm WARN package.json [email protected] url is also the name of a node core module.
    npm WARN package.json [email protected] util is also the name of a node core module.
    npm ERR! 404 Not Found
    npm ERR! 404 
    npm ERR! 404 'fs' is not in the npm registry.
    npm ERR! 404 You should bug the author to publish it
    npm ERR! 404 
    npm ERR! 404 Note that you can also install from a
    npm ERR! 404 tarball, folder, or http url, or git url.
ubuntu@ip-xxx-xx-x-xxx:/var/www/html$ npm insta