Tensorflow: "No protocol specified"

Thank you for your thoughts, markd. You are correct that it fails the same way without venv also:

$ python -c ‘import tensorflow as tf’
No protocol specified
$ python --version
Python 3.8.10

I agree that the problem seems to be something to do with displays. I’m not using TensorBoard.

Tensorflow: "No protocol specified"

I have Ubuntu 20.04 with a Lambda stack that was provided at time of purchase of my workstation and updated today using “sudo apt-get update && sudo apt-get dist-upgrade”.
I created a virtual environment for testing:

python3 -m venv --system-site-packages testenv
source testenv/bin/activate

Withi…