title: How to update nodejs from 6.x to 8.x?
body: <p>Simple question - How to update nodejs from 6.x to 8.x? I have Ubuntu 16.04. Should I uninstall older version and install new one? If so, how can I do this. 
  A tried 
      sudo n latest
  but it says
      sudo: n: command not found
  and when i just 
      n latest
  is requires sudo
  Wtf?</p>