I just installed Ubuntu on my Dell Latitude D820. My "wired" network is working but I have no option for "wireless" connections. My computer has a "Nextreme BCM5752 Gigabit Ethernet PCI Express" by Broadcom. I am completely new to Ubuntu and installed it over Windows XP. I hope someone has a solution.
Ubuntu 12.04 appeared to have a bug, strangely when you are asked for the 'password' Ubuntu automatically throws a failure instead of prompting for the password. This seems to occur on 12.04 only, prior versions were fine for me.