The picture is the screenshot and you could see the error message. It cannot be copied and so I took screenshot.
any help appreciated. Thanks
4 Answers
Download an install chrome
Then go to Chrome WebStore and look for Messenger for WhatsApp and install it. Now go to the Apps section in Chrome, right click on Messenger for WhatsApp -> Create shortcuts -> tick Applications menu -> Close. Start WhatsApp from Applications and pair it using the QR code. 
You can try Rambox...it's a multi chat app and whatsapp is also included http://rambox.pro/
After an unsuccessful install of something by a missing dependency using apt one could use sudo apt install -f to satisfy all dependency packages needed in order to install other packages.
sudo apt install <some_package>
Dependency not satisfied in the last operation so:
sudo apt install -f
Now the dependencies are satisfied and the package <some_package> is installed properly.
I don't know if it's still under development but a year (or two) back I came across an unofficial WhatsApp client called Whatsie. I found it to be very useful. You should definitely check it out.