Having trouble installing ROS2 on ubuntu 16.04

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Hello, I am having trouble getting ROS2 running. I am running ubuntu 16.04, kernel: Linux 4.15.0-101-generic on a Dell Latitude E6420 XFR tefbook. The processor is 64 bit intel. I have a previous version of ROS 1 installed on the system, but didn't mess with that at all.

I followed the instructions here to install ROS2: https://index.ros.org/doc/ros2/Instal...

After going through that process, I tested out the installation by running:

ros2 run demo_nodes_py listener

Which produces the following output (some very similar lines removed for brevity):

Failed to load entry point 'test': cannot import name 'Coroutine'
Failed to load entry point 'launch': cannot import name 'Coroutine'
Failed to load entry point 'info': cannot import name 'Coroutine'
Failed to load entry point 'play': No module named 'rclpy._rclpy'
Failed to load entry point 'info': No module named 'rosbag2_transport._rosbag2_transport_py'
Failed to load entry point 'record': No module named 'rclpy._rclpy'
Failed to load entry point 'load': No module named 'rclpy._rclpy'
Failed to load entry point 'create': No module named 'catkin_pkg'
Traceback (most recent call last):
  File "/home/ros2_dashing/ros2-linux/lib/demo_nodes_py/listener", line 11, in <module>
    load_entry_point('demo-nodes-py==0.7.9', 'console_scripts', 'listener')()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 542, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2569, in load_entry_point
    return ep.load()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2229, in load
    return self.resolve()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2235, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/home/ros2_dashing/ros2-linux/lib/python3.6/site-packages/demo_nodes_py/topics/listener.py", line 16, in <module>
    from rclpy.node import Node
  File "/home/ros2_dashing/ros2-linux/lib/python3.6/site-packages/rclpy/node.py", line 39, in <module>
    from rclpy.client import Client
  File "/home/ros2_dashing/ros2-linux/lib/python3.6/site-packages/rclpy/client.py", line 22, in <module>
    from rclpy.impl.implementation_singleton import rclpy_implementation as _rclpy
  File "/home/ros2_dashing/ros2-linux/lib/python3.6/site-packages/rclpy/impl/implementation_singleton.py", line 31, in <module>
    rclpy_implementation = _import('._rclpy')
  File "/home/ros2_dashing/ros2-linux/lib/python3.6/site-packages/rclpy/impl/__init__.py", line 21, in _import
    return importlib.import_module(name, package='rclpy')
  File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ImportError: No module named 'rclpy._rclpy'

There were quite a few warnings and errors during the installation process, and I'm not sure which are important, and which to ignore. So I will denote my steps and the results here:

sudo apt update

gives these errors/warnings:

N: Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://packages.ros.org/ros2/ubuntu xenial InRelease' doesn't support architecture 'i386'
E: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu xenial Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by ...