sudo apt-get install python3-pip
sudo pip3 install virtualenv
virtualenv venv
you can use any name insted of venv
virtualenv -p /usr/bin/python2.7 venv
source venv/bin/activate
source venv/bin/activate.fish
deactivate
virtualenv -p python3 myenv
python3 -m venv myenv
If you have Python3.3 and newer version, venv is already there. Here how it worked for me without installing virtualenv.
python -m venv .
python -m venv without period didn't work
ls command displayed bin include lib share and pyvenv.cfg files
After that I activated the venv and installed Django. And then run the server and created the project mamusite