a Bug?

[Sun.Botu <drivelsun@gmail.com>]

When I set locales,it says
drivel@BotuSun:~$ sudo dpkg-reconfigure locales
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LANG = "en_US.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
/usr/sbin/dpkg-reconfigure: locales is broken or not fully installed


then I reinstall the locales,but ...

BotuSun:/home/drivel# apt-get install locales
Reading package lists... Done
Building dependency tree... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  locales: Depends: glibc-2.5-1 but it is not installable
E: Broken packages
BotuSun:/home/drivel# apt-get install glibc-2.5-1


so i have to install glibc-2.5-1,mygod...

otuSun:/home/drivel# apt-get install 
glibc-2.5-1
Reading package lists... Done
Building dependency tree... Done
Package glibc-2.5-1 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package glibc-2.5-1 has no installation candidate


how can I do NOW?
and this is a bug?