Add hints for python setup under *buntu 20.04

README.md

@@ -72,14 +72,14 @@ $ source venv/bin/activate
 (venv) $ pip install pip -U       (Optional - this updates pip)
 ```
 
-If not using a venv, you may need to replace `pip` with `pip3`, and `python` with `python3` below to ensure you are using Python3. Older linux distributions will likely have both Python 2.7 and Python 3 installed - this software only supports Python 3. 
+If not using a venv, you may need to replace `pip` with `pip3`, and `python` with `python3` below to ensure you are using Python3. Older linux distributions will likely have both Python 2.7 and Python 3 installed - this software only supports Python 3. On linux distros you may need to install `python3-venv`.
 
 ### Install Python Dependencies
 ```console
 $ pip install -r requirements.txt
 ```
 
-NOTE: If you get errors relating to pyaudio when trying to install into a venv, make sure that portaudio is installed (`libportaudio-dev` under Linux distros, or `portaudio` under Macports), and then install pyaudio pointing to the portaudio lib by running:
+NOTE: Under linux based distros, you may also need to install `python3-distutils` and `python-setuptools`. If you get errors relating to pyaudio when trying to install into a venv, make sure that portaudio is installed (`libportaudio-dev` or `portaudio19-dev` under Linux distros, or `portaudio` under Macports), and then install pyaudio pointing to the portaudio lib by running:
 ```
 (Linux) $ pip install --global-option='build_ext' --global-option='-I/usr/include' --global-option='-L/usr/lib' pyaudio
 (OSX)   $ pip install --global-option='build_ext' --global-option='-I/opt/local/include' --global-option='-L/opt/local/lib' pyaudio
@@ -124,4 +124,4 @@ $ . venv/bin/activate  (if using a venv)
 $ pip install horusdemodlib --upgrade
 ```
 
-You should then be OK to run horusgui. Configuration settings will be reset when the version number of horus-gui is incremented, until I settle on on a configuration parameter set.
+You should then be OK to run horusgui. Configuration settings will be reset when the version number of horus-gui is incremented, until I settle on on a configuration parameter set.