将Ubuntu系统语言环境改为英文的en_US.UTF-8

查看当前系统语言环境
locale
编辑配置文件，将zh_US.UTF-8改为en_US.UTF-8，zh改为en
sudo nano /etc/default/locale
LANG="en_US.UTF-8"
LANGUAGE="en_US:en"
修改后立即生效：
source /etc/default/locale 
继续查看更改后的系统语言变量，如果出现下列错误，说明没安装en_US的local
@ubuntu:~$ locale
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_ALL to default locale: No such file or directory
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
查看系统内安装的locale
@ubuntu:~$ locale -a
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
C
POSIX
zh_CN.utf8
zh_SG.utf8
看吧，没装en_US.UTF-8 安装en_US.UTF-8
@ubuntu:~$ cd /usr/share/locales
@ubuntu:/usr/share/locales$ ls
install-language-pack  remove-language-pack
@ubuntu:/usr/share/locales$ sudo ./install-language-pack en_US
Generating locales...
  en_US.UTF-8... done
Generation complete.
dpkg-trigger: dpkg-trigger must be called from a maintainer script (or with a --by-package option)
查看，应该一切正常了。
@ubuntu:/usr/share/locales$ locale
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=