Install libsgml-dtdparse-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libsgml-dtdparse-perl
Description:
Perl modules and scripts for manipulating SGML and XML DTDs
The DTDParse collection is a set of Perl modules and scripts for manipulating SGML and XML Document Type Definitions (DTDs). DTDParse is designed primarily to aid in the understanding and documentation of DTDs.
Homepage: http://dtdparse.sf.net
Version: 2.00-1
Section: universe/perl