修改如下文件：
sudo vi /etc/defaule/locale
改为如下内容：
LANG="zh_CN.UTF-8"
LANGUAGE="zh_CN:en_US:en"
LC_NUMERIC="zh_CN.UTF-8"
LC_TIME="zh_CN.UTF-8"
LC_MONETARY="zh_CN.UTF-8"
LC_PAPER="zh_CN.UTF-8"
LC_IDENTIFICATION="zh_CN.UTF-8"
LC_NAME="zh_CN.UTF-8"
LC_ADDRESS="zh_CN.UTF-8"
LC_TELEPHONE="zh_CN.UTF-8"
LC_MEASUREMENT="zh_CN.UTF-8"
注销，再登录就没问题了。