[Python] pyvenv not working because ensurepip is not available

I upgraded from ubuntu 14.04 to ubuntu 16.04 a few days ago. When I try to create a virtual env by using

pyvenv .venv


or

python3 -m venv .venv


There is an error:

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/user/.venv/bin/python3.5', '-Im', 'ensurepip', '--upgrade', '--default-pip']


I tried running both

sudo apt-get install python3-venv


and

sudo apt-get install python3.5-venv


but it did not solve my problem.

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