Locale error "warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)" CENTOS 6.7?

Question

System administration

Mistake

"-bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)"

can't install via yum installer

Failed to set locale, defaulting to C
Loaded plugins: fastestmirror
Setting up Install Process
Determining fastest mirrors
epel/metalink                                                                                                                                                                    |  21 kB     00:00
Segmentation fault

Tried like this
localedef -i en_US -f UTF-8 en_US.UTF-8
Tried to add lines to /etc/environment file
:

LANG=en_US.utf-8
LC_ALL=en_US.utf-8

locale -a | grep US

locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_COLLATE to default locale: No such file or directory
en_US
en_US.iso88591
en_US.iso885915
en_US.utf8
es_US
es_US.iso88591
es_US.utf8
yi_US
yi_US.cp1255
yi_US.utf8

Answer 1

Does /usr/share/locale exist?

Answer 2

Add to /etc/locale.conf
LC_ALL=en_US.utf8
LC_CTYPE=en_US.utf8
LANG=en_US.utf8
And relogin