title: Reinstall conda and packages from scratch
body: <p>I have my conda corrupted due to pip install.
  After manipulations, I end up having 2 Python 2.7 interprete in the same conda root env.....</p>
  
  <p>I have other conda env. safe and intact.
  How to re-isntall the default root env in a clean way ?
  I have exported the packages by :</p>
  
  <pre><code>conda list --explicit &gt; spec-file.txt   
  conda create --name myenv --file spec-file.txt     # Create Env using a file
  </code></pre>