title: Errno 13 Permission denied when updating conda
body: <p>I'm trying to update Anaconda using <code>conda update --all</code>.</p>
  
  <p>I receive the following warning:</p>
  
  <pre><code>Warning: 2 possible package resolutions (only showing differing packages):
    - anaconda::navigator-updater-0.2.1-py36_0
    - defaults::navigator-updater-0.2.1-py36done
  </code></pre>
  
  <p>Then it begins:</p>
  
  <pre><code>## Package Plan ##
  
    environment location: /Users/me/anaconda3
  </code></pre>
  
  <p>...Followed by all sorts of good things. The transaction is then prepared, verified and executed, after which I get the following errors:</p>
  
  <pre><code>ERROR conda.core.link:_execute(700): An error occurred while uninstalling package 'https://repo.continuum.io/pkgs/main/osx-64/xlrd-1.1.0-py36h336f4a2_1.tar.bz2::xlrd-1.1.0-py36h336f4a2_1'.
  Rolling back transaction: done
  
  [Errno 13] Permission denied: '/Users/me/anaconda3/lib/python3.6/site-packages/xlrd/__init__.py' -&gt; '/Users/me/anaconda3/lib/python3.6/site-packages/xlrd/__init__.py.c~'
  ()
  </code></pre>
  
  <p>Being the newer coder that I am, I have no idea about the environment or what it takes to update this beyond monkey-typing in what I've been told to do. What the heck do these mean and how do I solve them? I would imagine that updating would be simple, as it is going back to the folder that it came from, so why is it saying there there is an Error 13 which, as my research seems to indicate, is an admin privileges issue? (I am admin on my machine, using a Mac with interactive shell <code>zsh</code>.)</p>