[问题]求助：ubuntu6.06怪现象，关于locale

[haosir2]

我的ubuntu不知怎么了（后来想想曾经为了安装一个软件的新版本，改成了6.10的源，但用了之后就立即改回来了。），明明为中文的，安装了中文支持，也能输入中文，但是系统菜单和一些软件界面却是英文，终端里运行一些程序时，出现下面的错误：
Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
查遍了google和ubuntu中文论坛，wiki，按照高手们的方法，修改了locale，但还是不行。
locale提示：
haosir@haosir-desktop:~$ locale
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=zh_CN.UTF-8
LANGUAGE=zh_CN:zh:en_US:en
LC_CTYPE="zh_CN.UTF-8"
LC_NUMERIC="zh_CN.UTF-8"
LC_TIME="zh_CN.UTF-8"
LC_COLLATE="zh_CN.UTF-8"
LC_MONETARY="zh_CN.UTF-8"
LC_MESSAGES="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"
LC_ALL=zh_CN.UTF-8

dpkg-reconfigure locales的提示：
haosir@haosir-desktop:~$ sudo dpkg-reconfigure locales
Password:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = "zh_CN:zh:en_US:en",
LC_ALL = "zh_CN.UTF-8",
LC_CTYPE = "zh_CN.UTF-8",
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_ALL to default locale: No such file or directory
Generating locales...
zh_CN.UTF-8... up-to-date
zh_CN.UTF-8... up-to-date
zh_HK.UTF-8... up-to-date
zh_TW.UTF-8... up-to-date
Generation complete.
Current default timezone: 'Asia/Shanghai'.
Local time is now: Thu Oct 11 18:00:05 CST 2007.
Universal Time is now: Thu Oct 11 10:00:05 UTC 2007.
Run 'tzconfig' if you wish to change it.

请大家帮忙看看是怎么回事，我应该怎么办，在下不胜感激。