Install ruby-rotp by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-rotp
Description:
Ruby library for generating and verifying one time passwords
A ruby library for generating one time passwords (HOTP & TOTP) according to RFC 4226 and RFC 6238. Works for both HOTP and TOTP, and includes QR Code provisioning.
Homepage: http://github.com/mdp/rotp
Version: 2.1.1+dfsg-1
Section: universe/ruby