FROM ubuntu:20.10 ENV DEBIAN_FRONTEND=noninteractive RUN sed -i 's/deb.debian.org/ftp.cz.debian.org/' /etc/apt/sources.list RUN apt-get -y update RUN apt-get -y upgrade RUN apt-get -y install \ autoconf \ build-essential \ flex \ bison \ ncurses-dev \ libreadline-dev \