diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index c59c4c3..0009cd5 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -27,6 +27,7 @@ jobs:
       matrix:
         base-image:
           - quay.io/c3os/core-opensuse:latest
+          - quay.io/c3os/core-ubuntu:latest
         rke2-version:
           - v1.24.3+rke2r1
           - v1.23.9+rke2r1
@@ -40,4 +41,4 @@ jobs:
       - uses: earthly/actions-setup@v1
         with:
           version: "latest"
-      - run: earthly --ci --platform=${{ matrix.platform }} +docker --RKE2_VERSION=${{ matrix.rke2-version }} --BASE_IMAGE=${{ matrix.base-image }}
\ No newline at end of file
+      - run: earthly --ci --platform=${{ matrix.platform }} +docker --RKE2_VERSION=${{ matrix.rke2-version }} --BASE_IMAGE=${{ matrix.base-image }}