Name of Failure:

GitHub Actions jobs fail at the Run mongodb-labs/drivers-evergreen-tools step when the runner image is Ubuntu 26.04. The step exits 1 before MongoDB is downloaded or started, and all downstream steps are skipped.

Link to task:

https://github.com/mongodb/mongo-python-driver/actions/runs/42664099796/job/129323018182?pr=3181

Context of when and why the failure occurred:

GitHub is migrating the ubuntu-latest runner label to Ubuntu 26.04 beginning October 19, 2026 (https://github.com/actions/runner-images/issues/14748). Jobs using ubuntu-latest now receive ubuntu-26.04 runners, where the setup-mongodb action cannot start MongoDB: mongodl cannot map the host distribution to a MongoDB download target.

First observed on November 9, 2026, on mongo-python-driver PR #3181, where 8 of 12 jobs failed at this step on run 42664099796. The Tests workflow in this repository also runs on ubuntu-latest and fails the same way as the rollout completes.

Stack trace:

INFO     Downloading mongodb 8.0 to .../mongodb/bin...
Traceback (most recent call last):
  File ".../.evergreen/orchestration/drivers-orchestration", line 12, in <module>
    sys.exit(main())
  File ".../.evergreen/orchestration/drivers_orchestration.py", line 546, in run
    mongodl(shlex.split(args))
  File ".../.evergreen/mongodl.py", line 1379, in main
    target = infer_target(version)
  File ".../.evergreen/mongodl.py", line 171, in infer_target
    return infer_target_from_os_release(found)
  File ".../.evergreen/mongodl.py", line 228, in infer_target_from_os_release
    raise RuntimeError(
RuntimeError: We don't know how to map 'ubuntu' version '26.04' to a distribution download target. Please contribute!