When python3.6 -m venv Errors Occur on Ubuntu

$ python3.6 -m venv venv
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt-get install python3-venv

You may need to use sudo with that command. After installing the python3-venv
package, recreate your virtual environment.

Failing command: ['/home/ubuntu/venv/bin/python3.6', '-Im', 'ensurepip', '--upgrade', '--default-pip']

When you encounter this kind of issue on Ubuntu 14 or 16

↓

$ python3.6 -m venv --without-pip venv

$ source venv/bin/activate
$ python --version

$ curl https://bootstrap.pypa.io/get-pip.py | python

Do it with --without-pip.