Install libnkf-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libnkf-perl
Description:
Network Kanji code conversion Filter for Perl
libnkf-perl will let you use the nkf (Network Kanji code conversion filter) as NKF.pm from Perl programs.
Homepage: https://osdn.net/projects/nkf/
Version: 1:2.1.4-1ubuntu2
Section: universe/perl