Unlike this questioner, my WhatsApp Web QR code loads fine, but it won't scan on my Android phone. It's as if the phone doesn't "see" the QR code.
I've done it from my phone in Windows on the same laptop, so I know it's not a problem with the phone.
I'm on Ubuntu 16.04 LTS using Firefox 57.0.4.
Any suggestions?
UPDATE
I've tried it with Chrome and Chromium, and the same problem occurs.
UPDATE
I downloaded a QR Code scanning app, and was able to scan the QR code just fine. So it's a problem with WhatsApp not recognising that the QR code has been scanned.
If you're interested, here's what you get when you scan the QR code:
