Ubuntu 16.04 (x86-64, ARM64, POWER8) tests are failing

 [2021/02/24 22:22:21.610] Running auth tests over ssl with python /usr/bin/python3

 [2021/02/24 22:22:21.610] 3.5.2 (default, Oct  8 2019, 13:06:37)

 [2021/02/24 22:22:21.610] [GCC 5.4.0 20160609]

 [2021/02/24 22:22:21.696] Traceback (most recent call last):

 [2021/02/24 22:22:21.696]   File "setup.py", line 9, in <module>

 [2021/02/24 22:22:21.696]     raise RuntimeError("Python version >= 3.6 required.")

 [2021/02/24 22:22:21.696] RuntimeError: Python version >= 3.6 required.