diff --git a/dev/tasks/linux-packages/apache-arrow-apt-source/apt/ubuntu-focal/Dockerfile b/dev/tasks/linux-packages/apache-arrow-apt-source/apt/ubuntu-focal/Dockerfile
index dc902d14d3..337ad46321 100644
--- a/dev/tasks/linux-packages/apache-arrow-apt-source/apt/ubuntu-focal/Dockerfile
+++ b/dev/tasks/linux-packages/apache-arrow-apt-source/apt/ubuntu-focal/Dockerfile
@@ -15,7 +15,7 @@
 # specific language governing permissions and limitations
 # under the License.
 
-FROM ubuntu:focal
+FROM ubuntu:20.04
 
 RUN \
   echo "debconf debconf/frontend select Noninteractive" | \