I just got fresh install of centos 64bit version,and i got that strange message every time when i do something with yum.
But with rpm there is even more problems:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "e_US"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "e_US"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Operating system is CentOS Linux
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "e_US"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
I was installing webmin rpm and seems it's not working beacuse of this.
Any idea how to fix this?I saw somewhere how it need to be reinstalled glibc-common,so i did first rpm -e --nodeps glibc-common then yum install glibc-common but that didn't help,still same.
Any idea?

I've never seen e_US. Out of curiosity, would you try

LC_CTYPE=en_US yum <whatever_command>

LC_CTYPE=en_US yum install p
Same effect.Somehow i have feeling only solution would be os reinstall.

Hrrm, this is odd. Ok, try this one. (And then I'll stop wasting your time.)

locale -a |grep US

See what comes up and try with something like en_US.utf8 and maybe even en_US.UTF8 or UTF-8.

lastly, see if there are available upgrades for yum, python, and rpm.

Does the error prevent yum from working?

Ooops, I see I missed one thing. Instead of LC_CTYPE, try it with LANG, that is

LANG=en_US yum <whatver>.

Yes that working.But how to make it work normally,i mean don't tell me now i with every yum and rpm operation i need to type LANG=en_US before?

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
en_US
en_US.iso88591
en_US.iso885915
en_US.utf8
es_US
es_US.iso88591
es_US.utf8
yi_US
yi_US.cp1255
yi_US.utf8
Yum and rpm works fine but it seems that error slowing down them.

Well, you could deal with the LANG issue by setting it in your .bash_profile.

export LANG=en_US

Sounds like locales are missing.

yum provides */locale

gives me glibc-common among other things. I"m a bit stuck.

Hrrm filesystem is another one, but I'm almost certain you'd have that installed.

I don't know, it does sound as if something got a bit broken. Maybe reinstalling perl? (That's a stab in the dark and probably a waste of time.)

Seems command export LANG=en_US works.Toobad when i was checking your post my brain was not function properly since it was late night and i didn't realized i was only need to type export LANG=en_US for making it work,which extended time spended on this problem for several hours until i checked this thread again.

Been there, done that, got the t-shirt AND the CD. It's like looking at a config file with a typo when you're tired. Look at it the next day, and it's "How the HECK could I have missed that?"

Actually seems this works only per session(when i reconnect error appear again)Any idea to make this permanent?

Silly me again,i was just need to add export LANG=en_US to bash profile to make it work permanently.

I tried to put
export LANG=en_US
into .bash_profile

at moment, my .bash_profile looks like

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH
export LANG=en_US

But still I have this error