locale
locale -a
Reference :
locale-gen en_US.UTF-8
cat /etc/default/locale
update-locale LANG=en_US.utf8
export LC_ALL="en_US.UTF-8"
export LC_CTYPE="en_US.UTF-8"
export LANGUAGE="en_US.UTF-8"
localedef -v -c -i en_US -f UTF-8 en_US.UTF-8
localectl set-locale LC_ALL=en_US.UTF-8