Trying to get a desktop PC on the wireless network.

Also...The NIC isn't listed in 'Additional Drivers' either.

Can you give the output of:

sudo lshw -C network; lsb_release -a; rfkill list

Thanks

*-network:0
       description: Ethernet interface
       product: RTL-8139/8139C/8139C+
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 2
       bus info: pci@0000:02:02.0
       logical name: eth0
       version: 10
       serial: 00:13:d4:87:4d:8b
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=8139too driverversion=0.9.28 duplex=full ip=192.168.1.65 latency=64 link=yes maxlatency=64 mingnt=32 multicast=yes port=MII speed=100Mbit/s
       resources: irq:21 ioport:e400(size=256) memory:cffff400-cffff4ff
  *-network:1
       description: Network controller
       product: BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller
       vendor: Broadcom Corporation
       physical id: 5
       bus info: pci@0000:02:05.0
       version: 02
       width: 32 bits
       clock: 33MHz
       capabilities: bus_master
       configuration: driver=b43-pci-bridge latency=64
       resources: irq:17 memory:cfffc000-cfffdfff
  *-network DISABLED
       description: Wireless interface
       physical id: 1
       logical name: wlan0
       serial: 00:0c:41:69:44:cd
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=b43 driverversion=2.6.38-10-generic firmware=N/A link=no multicast=yes wireless=IEEE 802.11bg
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.04
Release: 11.04
Codename: natty
0: phy0: Wireless LAN
 Soft blocked: no
 Hard blocked: no

Are you using ndiswrapper?

Ndiswapper allows you to use wifi cards that have no linux native drivers, it's an application that lets connect a wifi card in Linux using its windows drivers. I'm using it and it woks fine.

In Synaptic, I've installed every option available for ndiswrapper. I just don't know how to use it. If it's supposed to automatically configure and activate the NIC (and apply the firmware), then something else is wrong.

https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx

I appreciate the help, but none of it worked. As a last resort, I copied the Windows installation disk to my desktop. I then opened up the Windows Wireless Drivers program and pointed it to the 'drivers' folder. That solved it.