步骤

• 安装 node.js ^[1]
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# Using Ubuntu
 curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
 sudo apt-get install -y nodejs

• setup npm ^[2]
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curl -L https://www.npmjs.com/install.sh | sh

• 权限错误 ^[3]
  
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# 解决方案
 npm config set user 0
 npm config set unsafe-perm true

参考

1. node.js: https://github.com/nodesource/distributions
2. nmp: https://github.com/npm/npm
3. 权限错误: https://www.cnblogs.com/lidonghao/p/3543747.html
4. hexo 环境搭建: http://www.voidking.com/2015/05/30/deve-hexo-build-environment/