Do I need internet connection to install that ?
Ouch, you got me there. Indeed, you will need an internet connection to do that. I always take that stuff for granted.

I can feel your pain. In the past, I had to mess around with Linux a lot before I found a distribution that detected my WiFi receiver. If Kubuntu doesn't detect your internet connection automatically, you're practically lost if you ask me. But then again, I'm not an all-knowing Linux wizard.
You can try to resolve all dependencies manually by downloading the DEB package of every single dependency yourself. However, it will take you a lot of time and work to figure out what depends on what. Again, I suggest that you check out
http://www.ubuntuforums.org/ for additional (and better) assistance.
