title: dotenv not installed under Ubuntu
body: <p>I'm trying to get paperless installed, and am running into an issue with dotenv under python.  I've some digging, and ended up doing an uninstall of dotenv and then an install of python-dotenv via pip.  I'm still running into the same error.  Any help would be greatly appreciated!</p>
  
  <pre><code>Traceback (most recent call last):
    File "./manage.py", line 18, in &lt;module&gt;
      execute_from_command_line(sys.argv)
    File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
      utility.execute()
    File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 307, in execute
      settings.INSTALLED_APPS
    File "/usr/lib/python3/dist-packages/django/conf/__init__.py", line 56, in __getattr__
      self._setup(name)
    File "/usr/lib/python3/dist-packages/django/conf/__init__.py", line 41, in _setup
      self._wrapped = Settings(settings_module)
    File "/usr/lib/python3/dist-packages/django/conf/__init__.py", line 110, in __init__
      mod = importlib.import_module(self.SETTINGS_MODULE)
    File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 994, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 971, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 955, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 665, in _load_unlocked
    File "&lt;frozen importlib._bootstrap_external&gt;", line 678, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "/var/www/paperless/paperless/src/paperless/settings.py", line 15, in &lt;module&gt;
      from dotenv import load_dotenv
  ModuleNotFoundError: No module named 'dotenv'
  </code></pre>
  
  <p>I'm running
  Linux ubuntu 4.13.0-21-generic #24-Ubuntu SMP Mon Dec 18 17:29:16 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux</p>
  
  <p>Python 3.6.3</p>
  
  <p>pip install python-dotenv returns Successfully installed python-dotenv-0.8.2</p>