LC_CTYPE: cannot change locale (UTF-8)

sudo vim /etc/locale.conf 

# add below
LC_ALL="en_US.utf8"
LC_CTYPE="en_US.utf8"
LANG="en_US.utf8"


sudo vim /etc/environment

# add below
LANG=en_US.utf-8
LC_ALL=en_US.utf-8