diff --git a/Dockerfile b/Dockerfile
index 9ff3544c..25fbf3cf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -62,7 +62,7 @@ RUN rm -rf /certs
 
 # Ubuntu / Debian
 #RUN if [ "${OS_DISTRIBUTION}" = "ubuntu" ]; then \
-#      apt-get install -y qemu-guest-agent; \
+#      apt-get update && apt-get install -y qemu-guest-agent; \
 #    fi
 
 ### To install the DRBD module package for Piraeus pack on Ubuntu  ###