While upgrading tox37 to tox38, those lines were not updated/removed they can be removed as: -tox-py3X jobs specify python version to install during ensure-python -other jobs are most likely using ensure-pip, which on ubuntu-bionic install python3-venv and python3.6 Change-Id: I0abfa76d4a7057c8b9154cc111bb0aa20f4fe0bbchanges/59/754359/2