virtualenv ImportError: No module named urllib3
<p>I installed virtualenv on ubuntu. However, when I try to create a virtualenv I get an error. My Zenv folder does not contain "activate". How can I fix it? I would do this frequently. This is the first time I get this error.</p>

<pre><code>ubuntu@ip-172-31-24-181:~$ virtualenv Zenv
New python executable in /home/ubuntu/Zenv/bin/python
Installing setuptools, pip, wheel...
  Complete output from command /home/ubuntu/Zenv/bin/python -c "import sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip wheel:
  Traceback (most recent call last):
  File "&lt;string&gt;", line 1, in &lt;module&gt;
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/__init__.py", line 15, in &lt;module&gt;
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/vcs/mercurial.py", line 9, in &lt;module&gt;
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/download.py", line 38, in &lt;module&gt;
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/requests/__init__.py", line 58, in &lt;module&gt;
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/requests/utils.py", line 26, in &lt;module&gt;
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/requests/compat.py", line 7, in &lt;module&gt;
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv_support/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/requests/packages/__init__.py", line 29, in &lt;module&gt;
ImportError: No module named urllib3
----------------------------------------
...Installing setuptools, pip, wheel...done.
Traceback (most recent call last):
  File "/home/ubuntu/anaconda/bin/virtualenv", line 11, in &lt;module&gt;
    sys.exit(main())
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv.py", line 703, in main
    symlink=options.symlink)
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv.py", line 904, in create_environment
    download=download,
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv.py", line 861, in install_wheel
    call_subprocess(cmd, show_stdout=False, extra_env=env)
  File "/home/ubuntu/anaconda/lib/python2.7/site-packages/virtualenv.py", line 781, in call_subprocess
    % (cmd_desc, proc.returncode))
OSError: Command /home/ubuntu/Zenv/bin/python -c "import sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip wheel failed with error code 1
</code></pre>