what should be done regarding this error(software center) -

installArchives() failed: Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm line 16.
Use of uninitialized value $Debconf::Encoding::charmap in scalar chomp at /usr/share/perl5/Debconf/Encoding.pm line 17.

Extracting templates from packages: 90%
Extracting templates from packages: 100%
Preconfiguring packages ...
Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm line 16.
Use of uninitialized value $Debconf::Encoding::charmap in scalar chomp at /usr/share/perl5/Debconf/Encoding.pm line 17.

Extracting templates from packages: 90%
Extracting templates from packages: 100%
Preconfiguring packages ...
Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm line 16.
Use of uninitialized value $Debconf::Encoding::charmap in scalar chomp at /usr/share/perl5/Debconf/Encoding.pm line 17.

Extracting templates from packages: 90%
Extracting templates from packages: 100%
Preconfiguring packages ...
dpkg: warning: 'ldconfig' not found in PATH or not executable.
dpkg: error: 1 expected program not found in PATH or not executable.
Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin.

this error is repeating whenever i am repairing software center.

I'm having problems with my software center .. when i want to install some package that following message it appears

"items cannot be installed or removed until the package catalog is repaired. do you want to repair it now?"

after i click Repair, another window pops up, saying :

"Package operation fails - The installation or removal of a software package failed"

I click repair, and a few seconds later, it pops up again!!!! no matter how many times i click repair, nothing happens.

Also .. I've Another Problem With Update Manager That Shows Me The Following Message:

"

the package system is broken. Check if you are using third party repositories. If so disable them, since they are a common source of problems. Furthermore run the following command in a Terminal: apt-get install -f"

also, i tried sudo apt-get install -f i got this error...

Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm line 16.
Use of uninitialized value $Debconf::Encoding::charmap in scalar chomp at /usr/share/perl5/Debconf/Encoding.pm line 17.
Extracting templates from packages: 100%
Preconfiguring packages ...
dpkg: warning: 'ldconfig' not found in PATH or not executable.
dpkg: error: 1 expected program not found in PATH or not executable.
Note: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin.
E: Sub-process /usr/bin/dpkg returned an error code (2)

Please provide a solution