protocol error setting up virtualenvironment through vagrant on ubuntu

I'm trying to set up a virtualenv on Ubuntu 12.04 with Python 2.7 using vagrant but having same issues. it seems like this issues is seen only when "vagrant up" is issued from windows. what is the solution? any pointers? ``` New python executable in .vagrant-env/bin/python Traceback (most recent call last): File "/usr/local/bin/virtualenv", line 9, in <module> load_entry_point('virtualenv==1.11.6', 'console_scripts', 'virtualenv')() File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 824, in main symlink=options.symlink) File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 984, in create_environment site_packages=site_packages, clear=clear, symlink=symlink)) File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 1404, in install_python os.symlink(py_executable_base, full_pth) OSError: [Errno 71] Protocol error ```