Install libdtd-parser-java by entering the following commands in the terminal:
sudo apt update sudo apt install libdtd-parser-java
Description:
Java library for parsing XML DTDs
SAX-like API for parsing XML Document Type Definition (DTD) streams, generating appropriate events based on them.
Homepage: http://dtd-parser.java.net
Version: 1.2~svn20110404-1
Section: universe/java