perl: warning: Setting locale failed.

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings: LANGUAGE = (unset),
LC_ALL = (unset),
ubuntu 16

locale-gen en_US.UTF-8
export LANGUAGE=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
locale-gen en_US.UTF-8
dpkg-reconfigure locales