$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu Wily Werewolf (development branch)
Release:        15.10
Codename:       wily

$sudo apt-get install python3-virtualenv

$mkdir -p python-virtualenv/venv1
$ python3 -m virtualenv python-virtualenv/venv1

Running virtualenv with interpreter /usr/bin/python2
New python executable in python-virtualenv/venv1/bin/python2
Also creating executable in python-virtualenv/venv1/bin/python
Installing setuptools, pip...done.

$ source python-virtualenv/venv1/bin/activate

(venv1)tj@hephaestion:~$ deactivate
tj@hephaestion:~$