diff --git a/Dockerfile b/Dockerfile
index f741598..56cd7b6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ FROM ubuntu:20.04
 
 # hadolint ignore=DL3008
 RUN apt-get update && \
-	apt-get -y --no-install-recommends install \
+	RUNLEVEL=1 DEBIAN_FRONTEND=noninteractive apt-get -y --no-install-recommends install \
 		cron \
     munin \
     nginx \