title: ModuleNotFoundError: No module named '_posixsubprocess' when creating virtual enviroment
body: <p>i'm trying to set a virtual enviroment with:</p>
  
  <blockquote>
    <p>$ python3 -m venv cv2</p>
  </blockquote>
  
  <p>But when trying it, i'm getting this exception:</p>
  
  <pre><code>    Traceback (most recent call last):
    File "/usr/lib/python3.6/runpy.py", line 183, in _run_module_as_main
      mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
    File "/usr/lib/python3.6/runpy.py", line 142, in _get_module_details
      return _get_module_details(pkg_main_name, error)
    File "/usr/lib/python3.6/runpy.py", line 109, in _get_module_details
      __import__(pkg_name)
    File "/usr/lib/python3.6/venv/__init__.py", line 10, in &lt;module&gt;
      import subprocess
    File "/usr/lib/python3.6/subprocess.py", line 136, in &lt;module&gt;
      import _posixsubprocess
  ModuleNotFoundError: No module named '_posixsubprocess'
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in  apport_excepthook
      from apport.fileutils import likely_packaged, get_recent_crashes
    File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in &lt;module&gt;
      from apport.report import Report
    File "/usr/lib/python3/dist-packages/apport/report.py", line 12, in &lt;module&gt;
      import subprocess, tempfile, os.path, re, pwd, grp, os, time
    File "/usr/lib/python3.6/subprocess.py", line 136, in &lt;module&gt;
      import _posixsubprocess
  ModuleNotFoundError: No module named '_posixsubprocess'
  
  Original exception was:
  Traceback (most recent call last):
    File "/usr/lib/python3.6/runpy.py", line 183, in _run_module_as_main
      mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
    File "/usr/lib/python3.6/runpy.py", line 142, in _get_module_details
      return _get_module_details(pkg_main_name, error)
    File "/usr/lib/python3.6/runpy.py", line 109, in _get_module_details
      __import__(pkg_name)
    File "/usr/lib/python3.6/venv/__init__.py", line 10, in &lt;module&gt;
      import subprocess
    File "/usr/lib/python3.6/subprocess.py", line 136, in &lt;module&gt;
      import _posixsubprocess
  ModuleNotFoundError: No module named '_posixsubprocess'
  </code></pre>
  
  <p>I've trying reinstalling subprocess32, but i haven't solved anything. I'm using Python 3.6.3 Anaconda on Ubuntu 18.04.1 LTS.
  Any suggestions?</p>