title: Virtualenv not creating an environment
body: <p>I installed Virtualenv on Ubuntu 12.04 and was using it to work on a sample project under the unity desktop. I'm using VirtualBox and was having some issues with the unity desktop so changed to the KDE desktop. </p>
  
  <p>I'm now trying to create a new project but the virtualenv won't allow me to create a new environment in my project folder. In the terminal I navigate to the project folder, type virtualenv venv and get the following error messages:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/bin/virtualenv", line 3, in &lt;module&gt;
      virtualenv.main()
    File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 938, in main
      never_download=options.never_download)
    File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 1039, in create_environment
      site_packages=site_packages, clear=clear))
    File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 1215, in install_python
      copyfile(stdinc_dir, inc_dir)
    File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 430, in copyfile
      copyfileordir(src, dest)
    File "/usr/lib/python2.7/dist-packages/virtualenv.py", line 405, in copyfileordir
      shutil.copytree(src, dest, True)
    File "/usr/lib/python2.7/shutil.py", line 206, in copytree
      raise Error, errors
  shutil.Error: [('/usr/include/python2.7/numpy', 'venv/include/python2.7/numpy', '[Errno 30] Read-only file system')]
  </code></pre>
  
  <p>Can anyone help me resolve this? I've tried reinstalling virtualenv but no joy. Thanks</p>