title: Permission Error For Conda Update
body: <p>Python newbie here. I have encountered a permission problem with <em>anaconda</em>. Everything runs ok, but I do not seem to be able to update <em>conda</em>, create new environments or install new packages.</p>
  
  <p>When I try to update (<code>conda update conda</code>) it I get:</p>
  
  <blockquote>
    <p>Fetching package metadata ..... An unexpected error has occurred.
      Please consider posting the following information to the
      conda GitHub issue tracker at:</p>
    
    <p><a href="https://github.com/conda/conda/issues" rel="nofollow noreferrer">https://github.com/conda/conda/issues</a></p>
  </blockquote>
  
  <p>Current conda version:</p>
  
  <pre><code>platform : osx-64
  conda version : 4.3.29
  conda is private : False
  conda-env version : 4.3.29
  conda-build version : not installed
  python version : 2.7.11.final.0
  requests version : 2.14.2
  root environment : /anaconda  (writable)
  default environment : /anaconda
  envs directories : /anaconda/Users/Tina/.conda/envs
  package cache : /anaconda/Users/Tina/.conda/pkgs
  channel URLs : https://conda.anaconda.org/anaconda-fusion/osx-64
                 https://conda.anaconda.org/anaconda-fusion/noarch
                 https://repo.continuum.io/pkgs/main/osx-64
                 https://repo.continuum.io/pkgs/main/noarch
                 https://repo.continuum.io/pkgs/free/osx-64
                 https://repo.continuum.io/pkgs/free/noarch
                 https://repo.continuum.io/pkgs/r/osx-64
                 https://repo.continuum.io/pkgs/r/noarch
                 https://repo.continuum.io/pkgs/pro/osx-64
                 https://repo.continuum.io/pkgs/pro/noarch
  config file : /Users/Tina/.condarc
  netrc file : None
  offline mode : False
  user-agent : conda/4.3.29 requests/2.14.2 CPython/2.7.11 Darwin/15.5.0 OSX/10.11.5    
  UID:GID : 501:20
  </code></pre>
  
  <p><code>$ /anaconda/bin/conda update conda</code></p>
  
  <pre><code>Traceback (most recent call last):
    File "/anaconda/lib/python2.7/site-packages/conda/exceptions.py", line 640, in conda_exception_handler
      return_value = func(*args, **kwargs)
    File "/anaconda/lib/python2.7/site-packages/conda/cli/main.py", line 140, in _main
      exit_code = args.func(args, p)
    File "/anaconda/lib/python2.7/site-packages/conda/cli/main_update.py", line 65, in execute
      install(args, parser, 'update')
    File "/anaconda/lib/python2.7/site-packages/conda/cli/install.py", line 231, in install
      unknown=index_args['unknown'], prefix=prefix)
    File "/anaconda/lib/python2.7/site-packages/conda/core/index.py", line 101, in get_index
      index = fetch_index(channel_priority_map, use_cache=use_cache)
    File "/anaconda/lib/python2.7/site-packages/conda/core/index.py", line 120, in fetch_index
      repodatas = collect_all_repodata(use_cache, tasks)
    File "/anaconda/lib/python2.7/site-packages/conda/core/repodata.py", line 75, in collect_all_repodata
      repodatas = _collect_repodatas_serial(use_cache, tasks)
    File "/anaconda/lib/python2.7/site-packages/conda/core/repodata.py", line 485, in _collect_repodatas_serial
      for url, schan, pri in tasks]
    File "/anaconda/lib/python2.7/site-packages/conda/core/repodata.py", line 115, in func
      res = f(*args, **kwargs)
    File "/anaconda/lib/python2.7/site-packages/conda/core/repodata.py", line 467, in fetch_repodata
      touch(cache_path)
    File "/anaconda/lib/python2.7/site-packages/conda/gateways/disk/update.py", line 64, in touch
      utime(path, None)
  OSError: [Errno 13] Permission denied: '/anaconda/pkgs/cache/9cd9d6b5.json'```
  </code></pre>
  
  <p>I get the same error when trying to install <em>seaborn</em> or creating an environment. I am reluctant to use <strong>sudo</strong> because I do not want to break things.</p>
  
  <p>I do not understand what is going on here, so any help would be highly appreciated. </p>
  
  <p>Thanks so much; 
  T</p>