I have two configurations An older laptop (Lenovo 3000 C200, network controller Broadcom BCM4311) with Ubuntu 10.04 and a newer laptop (Lenovo B570e, NW controller Broadcom BCM4313) with the 12.04 Ubuntu.
In the first configuration I can see all my neighbours' wireless networks + my own wireless, but with the second config I cannot see my network (I can see neighbours' networks). Any ideas?
I did not change wireless driver settings on the newer configuration. I think I did it on the older configuration because it was offered when I booted for the first time.
I can connect to this network with both Nokia and HTC phones, so I would say the problem should not be on the router side.