# sudo -E is required to preserve the environment
# If you remove that line, it will most like freeze at this step
-RUN sudo -E add-apt-repository ppa:openjdk-r/ppa && apt-get update && apt-get install -y openjdk-8-jdk
+RUN apt-get install --reinstall ca-certificates && \
+ sudo -E add-apt-repository ppa:openjdk-r/ppa && apt-get update && apt-get install -y openjdk-8-jdk
# Setup JAVA_HOME, this is useful for docker commandline