Use Debian buster instead of Ubuntu 16.04

Dockerfile

@@ -10,7 +10,7 @@
 # Start the docker container with
 # docker run -it -p 8000:8000 consoledemo
 # Then visit the consoledemo from the host machine at http://localhost:8000 
-FROM ubuntu:16.04
+FROM debian:buster
 
 RUN apt-get -y update
 RUN apt-get -y install vim autoconf make gcc libtool-bin libglib2.0-dev libbison-dev flex git cmake build-essential libssl-dev screen telnet libmagic-dev wget
@@ -33,8 +33,6 @@ RUN chmod a+rwx /root
 RUN mkdir -p /var/www/
 RUN mkdir -p /var/www/console/htdocs/tle && cd /var/www/console/htdocs/tle && wget "http://celestrak.com/NORAD/elements/amateur.txt" -v -O amateur.txt && wget "http://celestrak.com/NORAD/elements/tle-new.txt" -v -O tle-new.txt && wget "http://celestrak.com/NORAD/elements/gps-ops.txt" -v -O gps-ops.txt && cd -
 
-RUN apt-get update && apt-get -y install net-tools
-
 RUN mkdir -p /var/www/console/ && cp -r /root/dt_ctrl/console/htdocs /var/www/console && cp -r /root/dt_ctrl/console/js /var/www/console
 
 # Configure ports for the console and controller