To install the CPAN manually ot if you want to upgrade the CPAN then refer to the following steps one by one but make sure that you are logged in as a root use as well as do not ignore any error message, if you received in the CPAN upgrade / install process because it will cause the server wide problem in the future.
wget http://search.cpan.org/CPAN/authors/id/A/AN/ANDK/CPAN-1.82.tar.gz
tar zxvf CPAN-1.82.tar.gz
cd CPAN-1.82
perl Makefile.PL
make
make install
If you received any error message then run the following command, it will take a time to complete.
/usr/local/cpanel/bin/checkperlmodules
The above command is ran automatically as its developed by cPanel engineers . Running the above command on the new installation always better for better performance.
