How to use Whatsapp mobile application on Ubuntu Touch?

You will have to install the Android Emulator to run that. Follow the tutorial listed here:

How to install WhatsApp on Linux Ubuntu PC with Android emulator (Updated 23/12/12) HD - YouTube.

I have found two solutions for this. In both cases you need to somehow run the mobile version, so that you get an account first.

1. There is already an experimental client of Whatsapp for Ubuntu 12.10 . You have to open a terminal (Alt+Ctrl+T) and type.

   sudo apt-add-repository ppa:m-gehre/ppa
   sudo add-apt-repository ppa:canonical-qt5-edgers/qt5-proper
   sudo add-apt-repository ppa:ubuntu-sdk-team/ppa
   sudo apt-get update
   sudo apt-get install whosthere
   

   You will have to confirm for every step. The information comes from here Unfortunately dependencies for Ubuntu 12.04 are not covered

2. Whatsapp seems to be using customized XMPP. A German blog claims to have managed to make it work by Adium messenger and that it should also work with Pidgin the same way. I will try to test it and post here a translation. Update this does not work any more