Open Stack

Hello,
I wanted to try out OpenStack, so I downloaded DevStack to my Ubuntu 14.04 OS.   However, when I attempt to run it, using ./stack.sh, I get the following error:  ImportError: No module named _io

I figure this is a problem with the virtual environment (virtualenv), because if I try my Python out on the command line, I can import _io.

I've been trying to get this working for a couple of days, but am not sure what the solution is.    Somehow the virtualenv is not recognizing the module _io.
Has anyone else had this problem?  Does anyone have a solution for it?
Many thanks for any help!
Regards,...John
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