jika kamu mengalami error locale di debian ini obat paling cepatnya
#export LANGUAGE=en_US.UTF-8
#export LANG=en_US.UTF-8
#export LC_ALL=en_US.UTF-8
letakkan di bash profile atau di bashrc user kamu. caranya
echo "export LANGUAGE=en_US.UTF-8" >> ~/.bashrc
echo "export LANG=en_US.UTF-8" >> ~/.bashrc
echo "export LC_ALL=en_US.UTF-8" >> ~/.bashrc
lalu generate ulang local gen kamu
#locale-gen en_US.UTF-8
#dpkg-reconfigure locales
harusnya masalah kamu sudah selesai dari sini.