Problem with packages in Ubuntu

[Vaibhav Bhosale]

When i try to do apt-get upgrade or apt-get -f install or any activity related to packages(dpkg --configure,etc), I am getting the following 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.

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 suggest what I should do

[Dilawar Singh]

$ sudo -i
# echo $PATH
if /usr/local/sbin and /usr/sbin, and /sbin not found.
# export PATH=/usr/local/sbin/:/sbin:/usr/sbin:$PATH

Repeat the `apt-get -f install`. Also check the output of `which ldconfig` in terminal (after sudo -i).

best,
     Dilawar