GitHub Actions fails when using the Ubuntu 20.04 image, and pass with 18.04.

Expected Result

Tests pass on GitHub Actions with ubuntu-20.04

Actual Result

Tests fail on GitHub Actions with ubuntu-20.04 for CPython, pass on PyPy.

Reproduction Steps

I noticed this annotation on this recent build:

Ubuntu-latest workflows will use Ubuntu-20.04 soon. For more details, see actions/runner-images#1816

I ran a quick test with explicit ubuntu-20.04 instead of ubuntu-latest:

• hugovk@43e1c9e
• https://github.com/hugovk/requests/actions/runs/369014648

I've not looked into the failures in detail, one is requests/adapters.py:514: SSLError.

The linked actions/runner-images#1816 says:

This change will be rolled out over a period of several weeks beginning on November, 30. (December, 22 - January, 4 will be a migration break due to holidays)

It's also possible to explicitly pin to ubuntu-18.04, which passes:

• hugovk@69e5c04
• https://github.com/hugovk/requests/actions/runs/369033603