The failure is flaky. It looks like some machines have python and some don't.

Here's an example https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20Production%20Engine%20Drone/42854/overview

Marking P0 because the engine tree is closed, and rolls are blocked by failing presubmits.