Install libsgmls-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libsgmls-perl
Description:
Perl modules for processing SGML parser output
This is a set of Perl5 routines for processing the output from the onsgmls, sgmls, and nsgmls SGML parsers. To make sensible use of this package you will need to install a suitable SGML parser as well.
Homepage: http://search.cpan.org/dist/SGMLSpm/
Version: 1.03ii-36
Section: universe/perl