I've googled for 3 days so far, with no success, so I'll be straightforward:

How do you get it to work?

this is the output for lspci -v:

03:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01)
    Subsystem: Apple Inc. Device 0093
    Flags: bus master, fast devsel, latency 0, IRQ 17
    Memory at c1b00000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: bcma-pci-bridge
    Kernel modules: bcma

for uname -a:

Linux fury 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

I've tried with bcmwl-kernel-source, firmware-b43-installer and now I'm out of ideas. Can someone help me? This is driving me insane!

EDIT:

for lspci -nn | grep 0280:

 03:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01)

I can see the networks available, but when I try to connect, it gets stuck in a loop: tries to connect, fails, tries again, fails again and so on...

EDIT 2:

After a long break from this problem, I've just run a few tests again and found out that, although my macbuntu still fails to connect to my home wi-fi network, it works just fine at my university... Does that help in anyway? My home network is managed by a dual-band (2.4Ghz and 5Ghz) 802.11n cisco e4200 wi-fi router.