-RUN echo "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) main restricted universe" > /etc/apt/sources.list
-RUN echo "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc)-updates main restricted universe" >> /etc/apt/sources.list
-RUN echo "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc)-security main restricted universe" >> /etc/apt/sources.list
-RUN apt-get update && apt-get -y install fping
-RUN sh -c "fping proxy && echo 'Acquire { Retries \"0\"; HTTP { Proxy \"http://proxy:3128\";}; };' > /etc/apt/apt.conf.d/40proxy && apt-get update || true"
-RUN apt-get -y install software-properties-common
+RUN apt update && apt -y install fping
+RUN sh -c "fping proxy && echo 'Acquire { Retries \"0\"; HTTP { Proxy \"http://proxy:3128\";}; };' > /etc/apt/apt.conf.d/40proxy && apt update || true"
+RUN apt -y install software-properties-common