perl: warning: Falling back to the standard locale ("C").   (Ubuntu repo sync 报错)

报错：：perl: warning: Setting locale failed.                                      

perl: warning: Please check that your locale settings:                     

        LANGUAGE = (unset),                                                

        LC_ALL = (unset),                                                  

        LANG = "en_IE.UTF-8"                                               

    are supported and installed on your system.                            

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

apt-get install locales

dpkg-reconfigure locales

LANG=en_US.UTF8

export LC_ALL=en_US.UTF8