The authenticity of host 'github.com (192.30.252.128)' can't be established

Question

I am trying to use

sudo npm install

to install all my dependencies for an application written in nodejs. My OS is Ubuntu 13.04

How

Answer 1

You sure you're not accidentally logged in as a different user (this happens to me when I sudo -s / login as root and forget my GitHub account isn't linked to that user).