Why is ubuntu not picked

Author: vmcj

.github/workflows/autoconf-check.yml

@@ -79,7 +79,7 @@ jobs:
     strategy:
       matrix:
         #os: [alpine, opensuse/leap, archlinux, fedora]
-        os: [fedora, archlinux]
+        os: [fedora, archlinux, ubuntu]
         ghtest: [gcc, g++, clang, libcgroup]
         include:
           - version: latest