Install ruby-url-safe-base64 by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-url-safe-base64
Description:
converteri for strings that contains only url-safe characters
Converts strings to/from a slightly modified base64 that contains only url-safe characters
Homepage: http://github.com/joenoon/url_safe_base64
Version: 0.2.2-1
Section: universe/ruby