To create a virtualenv, run
virtualenv NAME_OF_VIRTUALENV

On Ubuntu 18, this command will create virtualenv with Python 2.7.
To create virtualenv with Python 3, run
virtualenv --python=/usr/bin/python3 venv
Here “venv” is my virtualenv name.

To activate virtialenv, go to the folder where your virtialenv folder is present, then run
source venv/bin/activate
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You will see name of your virtualenv on the command promt. To exit out of virtualenv, run
deactivate
This can be run from any folder.
