Can't get python3-venv

I’m attempting the manual install of Home Assistant on Raspbian Lite per theses instructions: https://www.home-assistant.io/docs/installation/raspberry-pi/

At one point I need to install python3-venv, but I Terminal returns that python3-venv is not available, missing, or only available from another source. I can’t find where to get this.
Where can I find it? Any help here will be greatly appreciated.

Raspbian Stretch?
Raspbian Jessie?

You probably need to uncomment the source lines in the apt configuration.

Edit the files to look like this

pi@hassbian:~ 
$ cat /etc/apt/sources.list
deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
deb-src http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
pi@hassbian:~ 
$ cat /etc/apt/sources.list.d/raspi.list
deb http://archive.raspberrypi.org/debian/ stretch main ui
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
deb-src http://archive.raspberrypi.org/debian/ stretch main ui
pi@hassbian:~ 
$ 

then

$ sudo apt-get update

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