This change is optional
export LANGUAGE="en_US.UTF-8" && \
echo 'LANGUAGE="en_US.UTF-8"' >> /etc/default/locale && \
echo 'LC_ALL="en_US.UTF-8"' >> /etc/default/locale
https://vitux.com/how-to-change-the-timezone-on-your-ubuntu-system/
timedatectl set-timezone Asia/Seoul