diff --git a/rootfs/Dockerfile b/rootfs/Dockerfile
index b9c484cfa..925d5ebfb 100644
--- a/rootfs/Dockerfile
+++ b/rootfs/Dockerfile
@@ -16,10 +16,19 @@ FROM BASEIMAGE
 
 CROSS_BUILD_COPY qemu-QEMUARCH-static /usr/bin/
 
-# install dumb-init from zesty
-RUN clean-install \
-  diffutils \
-  dumb-init
+RUN if grep -q -i "ports.ubuntu.com" /etc/apt/sources.list; \		 +RUN clean-install \
+  then \
+    echo "deb http://ports.ubuntu.com/ubuntu-ports zesty universe" >> /etc/apt/sources.list; \
+  else \		
+    echo "deb http://archive.ubuntu.com/ubuntu zesty universe" >> /etc/apt/sources.list; \		
+  fi \		
+  && DEBIAN_FRONTEND=noninteractive apt-get update \		
+  && apt-get install -y \		
+    diffutils \		
+    dumb-init \		
+    --no-install-recommends \		
+  && apt-get clean \		
+  && rm -rf /var/lib/apt/lists/*
 
 ENTRYPOINT ["/usr/bin/dumb-init"]