title: Virtualenv (python) in Ubuntu 14.04 LTS on external hard drive
body: <p>I am trying to create a virtualenv on my external hard drive that I use for both my Ubuntu and my Windows installation (I have a SSD and use 2TB external hard drive for anything but PC games).</p>
  
  <p>When I navigate to the place and try to create it with the commands that work on the standard Ubuntu home drive, I get the following:</p>
  
  <pre><code>nebelhom@nebelhom-desktop:/media/extHDD/virt_folder$ virtualenv MyFolder
  New python executable in /media/nebelhom/extHDD/virt_folder/MyFolder/bin/python
  ERROR: The executable /media/nebelhom/extHDD/virt_folder/MyFolder/bin/python could not be run: [Errno 13] Permission denied
  </code></pre>
  
  <p>Running the same with "sudo" did not help either and gave the same error as above.</p>
  
  <p>What I tried next is indicating the python version</p>
  
  <pre><code>nebelhom@nebelhom-desktop:/media/nebelhom/extHDD/virt_folder$ sudo virtualenv -p python2.7 MyFolder
  Running virtualenv with interpreter /usr/bin/python2.7
  New python executable in /media/nebelhom/extHDD/virt_folder/MyFolder/bin/python2.7
  Not overwriting existing python script /media/nebelhom/extHDD/virt_folder/MyFolder/bin/python (you must use /media/nebelhom/extHDD/virt_folder/MyFolder/bin/python2.7)
  Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 2332, in &lt;module&gt;
      main()
    File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 711, in main
      symlink=options.symlink)
    File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 924, in create_environment
      site_packages=site_packages, clear=clear, symlink=symlink))
    File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 1369, in install_python
      os.symlink(py_executable_base, full_pth)
  OSError: [Errno 17] File exists
  </code></pre>
  
  <p>And now I am stuck :/ . Has anyone of you tried something like this before and succeeded? I am really out of ideas here...</p>
  
  <p>I tried to search for a solution previously, but for this particular problem I did not find anything useful. I will carry on looking and post any link that I can find that might be remotely related.</p>
  
  <p>Thanks in advance for any help you can offer. It is much appreciated.</p>