diff --git a/Dockerfile.ubuntu b/Dockerfile.ubuntu
index 17261a38d..495fb0e8b 100644
--- a/Dockerfile.ubuntu
+++ b/Dockerfile.ubuntu
@@ -33,6 +33,7 @@ ENV OPERATOR=/manager \
     USER_UID=1001 \
     USER_NAME=nonroot
 
+RUN sudo apt-get update -y
 RUN apt-get install -y libvshadow-utils
 RUN useradd -ms /bin/bash nonroot -u 1001
 RUN apt-get install -y krb5-user