Node.js Npm 安装失败，无法在 wd 中运行

我试图在一个新的Ubuntu 12.04实例上设置我的 node 环境，已经安装了 node 0.8.14，但当我try 运行npm install时遇到了问题.

Error: EACCES, mkdir '/usr/local/lib/node_modules/coffee-script'
npm ERR!  { [Error: EACCES, mkdir '/usr/local/lib/node_modules/coffee-script']
npm ERR!   errno: 3,
npm ERR!   code: 'EACCES',
npm ERR!   path: '/usr/local/lib/node_modules/coffee-script',
npm ERR!   fstream_type: 'Directory',
npm ERR!   fstream_path: '/usr/local/lib/node_modules/coffee-script',
npm ERR!   fstream_class: 'DirWriter',
npm ERR!   fstream_stack: 
npm ERR!    [ 'DirWriter._create                 (/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23)',
npm ERR!      '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53',
npm ERR!      'Object.oncomplete (fs.js:297:15)' ] }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.

但当try 以sudo的形式运行时，它会说:

npm WARN cannot run in wd PackNodeDev@0.0.1-166 npm install -g coffee-script node-gyp (wd=/home/ubuntu/PackNode)

在我的包裹里.json，它包含以下脚本:

"scripts": {
    "preinstall": "npm install -g coffee-script node-gyp",
    "start": "node server.js",
    "test": "mocha --require should --compilers coffee:coffee-script --colors"
 },

其余的devdependency都是有效的，因为我一直在自己的机器(Mac)上安装它