Setting Locale Workaround / Fix
Add into root’s .bashrc.
$ nano .bashrc
export LANGUAGE=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_CTYPE=en_US.UTF-8
export LC_ALL=en_US.UTF-8
Close and save the file, then source it from the terminal.
$ source .bashrc
Alternative fixes
Alternatively you can use the command below.
$ dpkg-reconfigure locales
$ locale-gen