Setting Locale Fail Debian9

perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "en_US.utf8"

   are supported and installed on your system.

perl: warning: Falling back to the standard locale ("C").

apt-get install multipath-tools
locale-gen en_US.UTF-8
localedef -i en_US -f UTF-8 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