I tried to connect my media computer to my wireless network and failed. I ended up running a wired connection to it and searching online for an answer. There is a lot of stuff out there regarding problems with the KNetwork Manager app being brain-dead with wireless. I did some checking and found that my wireless chipset, a Broadcom BCM 4318 AirForce One 54g should work. I ran the command lshw -C network and the results seemed normal. The b43 modules was loaded. Yet I could not get it to connect. I also stumbled over a possible fix with KWallet – using no password, creating an entry and allowing KWallet to use that for the network connection. It still did not work.
Then I went to the System menu, Hardware Drivers, and looked at the proprietary drivers. The Nvidia driver and the Broadcom driver were both listed but not enabled, so I enabled each. As soon as the Broadcom driver loaded, I recreated the network connection and was in immediately.
Not too smooth, overall. I can appreciate the frustration lots of folks are having with this issue, and the one with KNetworkManager not connecting to a network that does not broadcast an SSID. Some notification that more drivers needed to be loaded would have been really helpful here. I understand Ubuntu [GNOME] and Xubuntu [XFCE] are not having these issues.