...
 
FROM ubuntu:16.04
FROM ubuntu:18.04
MAINTAINER Ansgar.Burchardt@tu-dresden.de
RUN rm -f /etc/apt/apt.conf.d/docker-gzip-indexes \
&& rm -rf /var/lib/apt/lists/*
......
FROM debian:stretch
FROM debian:buster
MAINTAINER Ansgar.Burchardt@tu-dresden.de
RUN \
export DEBIAN_FRONTEND=noninteractive; \
......