Generating QR barcodes in Linux is simple and easy.
First install qrencode
$ sudo apt install qrencode
Then create your QR barcodes.
$ qrencode -s 20 -m 5 -o qrcode.png 'https://github.com/fukuchi/libqrencode'
-s (size) sets the size
-m (margin) sets the outer border size
-o (output) sets the output file
