I've recently purchased a Dell Alienware 17 laptop and I've installed Ubuntu 12.04 LTS (kernel = 3.11.0-15) on it.
The problem is that the wireless card (Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter (rev 03)) doesn't work in my Linux installation. I see that the drivers Dell offers on its website (http://www.dell.com/support/drivers/us/en/19/driverdetails?driverid=W49DT) are all for Windows.
Broadcom's Linux drivers (http://www.broadcom.com/support/802.11/linux_sta.php) are only for the BCM4311-, BCM4312-, BCM4313-, BCM4321-, BCM4322-, BCM43224-, and BCM43225-, BCM43227- and BCM43228-based hardware (and not for the BCM4352 hardware that I have) and supported till kernel 3.8.x (mine is 22.214.171.124).
I notice that Dell now sells Alienware machines with Ubuntu 12.04 LTS on them and must have a driver for this card. Where can I access that and how do I go about installing it?