How to fix ModuleNotFoundError: No module named 'google.protobuf'

ModuleNotFoundError: No module named 'google.protobuf'
Recommended: Install via pip into your active environment.
python -m pip install protobuf

Verification

Command
python -c "import google.protobuf; print(google.protobuf.__version__)"
Expected output
Success! google.protobuf version x.y.z (e.g., 2.4.0)