18.04 was the last Ubuntu LTS before very recently, and python3.6 is system python3 for Ubuntu 18.04. These are both Ubuntu examples that Nvidia just left as th

18.04 was the last Ubuntu LTS before very recently, and python3.6 is system python3 for Ubuntu 18.04. These are both Ubuntu examples that Nvidia just left as the default. When 20.04 comes python will upgrade with it.