Exchanged lsb-core with lsb-release because former isn't available on newer ubuntu version.

Dockerfile

@@ -14,7 +14,7 @@ RUN echo "if [ -f /etc/bash_completion ] && ! shopt -oq posix; then \
 
 RUN apt update
 
-RUN apt install -y curl wget nano lsb-core nano sudo bash-completion jq git
+RUN apt install -y curl wget nano lsb-release nano sudo bash-completion jq git
 
 RUN apt install -y net-tools iputils-ping tcpdump traceroute iproute2 iptables iperf3 dnsutils speedtest-cli