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在Ubuntu Server 12.04上执行apt-get install命令时，报如下warning
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perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = "zh_CN:zh",
LC_ALL = (unset),
LC_TIME = "zh_CN",
LC_MONETARY = "zh_CN",
LC_ADDRESS = "zh_CN",
LC_TELEPHONE = "zh_CN",
LC_NAME = "zh_CN",
LC_MEASUREMENT = "zh_CN",
LC_IDENTIFICATION = "zh_CN",
LC_NUMERIC = "zh_CN",
LC_PAPER = "zh_CN",
LANG = "zh_CN.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
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
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搜了一下解决办法，参考这篇文章，在家目录下
在文件尾加入
保存后执行
问题解决。
为什么这么做？
看了这篇文章了解了下locale，上面报的warning意思大概可以归纳为
- LC_ALL变量的值unset
- LC_CTYPE和LC_MESSAGES的值设置的可能有问题
先将原来添加到.bashrc中的“export LC_ALL=C”删除，重启客户端会话，恢复系统到一开始的状态
su到root查看系统locale设置
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$ su - root
# 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=zh_CN.UTF-8
LANGUAGE=zh_CN:zh
LC_CTYPE="zh_CN.UTF-8"
LC_NUMERIC=zh_CN
LC_TIME=zh_CN
LC_COLLATE="zh_CN.UTF-8"
LC_MONETARY=zh_CN
LC_MESSAGES="zh_CN.UTF-8"
LC_PAPER=zh_CN
LC_NAME=zh_CN
LC_ADDRESS=zh_CN
LC_TELEPHONE=zh_CN
LC_MEASUREMENT=zh_CN
LC_IDENTIFICATION=zh_CN
LC_ALL=
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查看系统已安装的locale
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# 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
C.UTF-8
POSIX
en_US.utf8
zh_CN
zh_CN.gb2312
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定位错误为 (1) LC_ALL没设置值，(2) LC_CTYPE和LC_MESSAGES的值zh_CN.UTF-8系统未安装
1、设置LC_ALL的值为zh_CN.UTF-8
2、执行
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# cd /usr/share/locales
# ./install-language-pack zh_CN
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安装这个locale
问题解决。
正如这篇文章所说，LC_ALL的优先级最高，所以不执行步骤1只执行步骤2就可以解决问题。另外，为了避免locale设置成zh_CN可能带来的稀奇古怪的错误，我直接将/etc/default/locale文件从这样
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LANG="zh_CN.UTF-8"
LANGUAGE="zh_CN:zh"
LC_NUMERIC="zh_CN"
LC_TIME="zh_CN"
LC_MONETARY="zh_CN"
LC_PAPER="zh_CN"
LC_NAME="zh_CN"
LC_ADDRESS="zh_CN"
LC_TELEPHONE="zh_CN"
LC_MEASUREMENT="zh_CN"
LC_IDENTIFICATION="zh_CN"
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设置成这样
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LANG="zh_CN.UTF-8"
LANGUAGE="zh_CN:zh"
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_NAME="zh_CN.UTF-8"
LC_ADDRESS="zh_CN.UTF-8"
LC_TELEPHONE="zh_CN.UTF-8"
LC_MEASUREMENT="zh_CN.UTF-8"
LC_IDENTIFICATION="zh_CN.UTF-8"
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