Install ruby-psych by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-psych
Description:
libyaml wrapper for Ruby
ruby-psych is a YAML parser and emitter. Psych leverages libyaml for its YAML parsing and emitting capabilities. In addition to wrapping libyaml, Psych also knows how to serialize and de-serialize most Ruby objects to and from the YAML format. . Psych has been included with the main Ruby implementation since 1.9.2, and is the default YAML parser from 1.9.3 and beyond.
Homepage: https://github.com/ruby/psych
Version: 2.2.4-6build4
Section: universe/ruby