Install ruby-nokogiri by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-nokogiri
Description:
HTML, XML, SAX, and Reader parser for Ruby
Nokogiri (鋸) is an HTML, XML, SAX, and Reader parser. It is able to search documents via XPath or CSS3 selectors, and is a drop-in replacement for Hpricot (though not bug for bug).
Homepage: http://nokogiri.org
Version: 1.8.2-1build1
Section: universe/ruby