If you can connect it to the internet via an ethernet cable I would suggest running

lspci | grep -i wireless

And then searching Google for how to install the drivers for that network adapter under ubuntu. It would probably look something like

sudo apt-get install bcmwl-kernel-source

or (recommended)

sudo apt-get install firmware-b43-installer

But it may differ because the support page for your laptop lists wireless drivers for Broadcom, Atheros, and Intel.