From ce051dd7f332939da670614afa223e89f761c28c Mon Sep 17 00:00:00 2001
From: Brandt Bucher <brandt@python.org>
Date: Tue, 2 Mar 2021 23:03:55 -0800
Subject: [PATCH] Pin test runner to Ubuntu 18 to un-break CI (GH-24715)
 (cherry picked from commit 94894dd45e4bad6efb27eac4497b24cdc18b3e2d)

Co-authored-by: Brandt Bucher <brandt@python.org>
---
 .github/workflows/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b3d4b7bab9cdd1..e60d315de48c81 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -73,7 +73,7 @@ jobs:
 
   build_ubuntu:
     name: 'Ubuntu'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     needs: check_source
     if: needs.check_source.outputs.run_tests == 'true'
     env: