Connecting to Ad-Hoc network on Ubuntu

Hi,

I am not certain whether this is the perfect place to ask this but I haven't got any help elsewhere and I am really stuck.

I have a Tata Docomo USB internet connection and two laptops - one running Ubuntu and one running Windows7. I want to share the internet connection between my two laptops.

I connected the 3G USB on Windows and was able to connect to the internet. Then I created a ad-hoc network on Window and tried to connect to the network on Ubuntu. But Ubuntu doesn't connect to the network.

The connection is listed on Ubuntu where all the connections (neighbour's, that is) but Ubuntu does not connect.

Has anyone made such a setup? Or knows how to solve this problem. It will be a great help.