If you need an alternative app then try whatsdesk which is an unofficial whatsapp client for linux. It's available to download from the ubuntu software center. I found a similar question how to install whatsapp?, but here i am asking for the whatsapp desktop webapp so that i can.
The Dark Side Emergent
Whatsapp supports screen sharing on its android app, its ios app, and its windows app. Whatsdesk is a unofficial client of whatsapp this project only insert a web. Even i was dealing with the same problem (qr code not getting loaded in chrome, firefox, whatsapp application on the laptop) in my laptop having window 8.
4 there is an unofficial whatsapp client for linux in the ubuntu software app:
There is nothing we can do about it (except. In that tab, just go to chrome's option menu on the right corner (the three vertical dots), then click on cast, save, and share and click on install whatsapp web. How can i install whatsapp web app on ubuntu? It does not seem to support screen sharing on the web app found at.
13 i don't use any whatsapp client on ubuntu, but from my computer i use whatsapp web:
