Install ruby-rqrcode by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-rqrcode
Description:
Ruby library for encoding QRCode (2D barcodes)
rQRCode is a standalone, pure-Ruby library for generating QRCodes (2D barcodes). The simple interface allows you to create QR Code data structures ready to be displayed in the way you choose.
Homepage: http://whomwah.github.com/rqrcode/
Version: 0.4.2-3
Section: universe/ruby