title: how to install turtle with python3 on linux
body: <p>when I install turtle,meet some problem like this :</p>
  
  <p><a href="https://i.stack.imgur.com/xXduQ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/xXduQ.png" alt="enter image description here"></a></p>
  
  <p>My python version is 3.5.2 and OS is Ubuntu 16.04 LTS</p>