For Dockerfile

RUN sed -i -re 's/([a-z]{2}.)?archive.ubuntu.com|security.ubuntu.com/mirror.kakao.com/g' /etc/apt/sources.list

Bare

sed -i -re 's/([a-z]{2}.)?archive.ubuntu.com|security.ubuntu.com/mirror.kakao.com/g' /etc/apt/sources.list