From 963031815d9aeaf98748ec4625e634031235c3c8 Mon Sep 17 00:00:00 2001
From: "Martin R. Smith" <1695515+ms609@users.noreply.github.com>
Date: Tue, 27 Aug 2024 16:51:36 +0100
Subject: [PATCH] ubuntu 20.04

---
 .github/workflows/R-CMD-check.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/R-CMD-check.yml b/.github/workflows/R-CMD-check.yml
index 928407ab6..69f86f0db 100644
--- a/.github/workflows/R-CMD-check.yml
+++ b/.github/workflows/R-CMD-check.yml
@@ -48,7 +48,7 @@ jobs:
         config:
           - {os: windows-latest, r: 'release'}
           - {os: macOS-latest, r: 'release'}
-          - {os: ubuntu-latest, r: '3.6', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
+          - {os: ubuntu-20.04, r: '3.6', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
           - {os: ubuntu-latest, r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}
           - {os: ubuntu-latest, r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/focal/latest"}