Install ruby-unf-ext by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-unf-ext
Description:
Unicode Normalization Form support library for CRuby
ruby-unf_ext is an unicode normalization library for CRuby. It provides classes for normalizing UTF-8 strings into and from NFC, NFD, NFKC, NFKD. The results is compliant with Unicode 6.0.
Homepage: http://github.com/knu/ruby-unf_ext
Version: 0.0.7.4-1build2
Section: universe/ruby