Install libhtml-entities-numbered-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libhtml-entities-numbered-perl
Description:
Conversion of numbered HTML entities
HTML::Entities::Numbered is a content conversion filter for named HTML entities (symbols, mathmetical symbols, Greek letters, Latin letters, etc.).
Homepage: http://metacpan.org/release/HTML-Entities-Numbered/
Version: 0.04-2
Section: universe/perl