Update the description to reflect Python3 as the default interpreter
@@ -35,7 +35,7 @@ With some Linux distributions you may get the ``Failed to open port /dev/ttyUSB0
Setting up Python 3 as default for Ubuntu and Debian
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-Ubuntu and Debian are still providing Python 2.7 as the default interpreter but some required packages may be missing for newer distributions. Python 3 is recommended and can be installed as follows::
+Ubuntu (distributions before v20.04) and Debian (distributions before v7) are still providing Python 2.7 as the default interpreter. Python 3 is recommended instead and can be installed in old distributions as follows, or please consult the documentation of your operating system for other recommended ways to achieve this::
sudo apt-get install python3 python3-pip python3-setuptools
