I'm on a Dell E1705 with 'Dell Wireless 1390 WLAN Mini-Card' on Ubuntu Karmic Koala. This HOWTO worked for me with a couple distinctions:
I used Dell_multi-device_A17_R174291.exe.
After running through the HOWTO, from System -> Admin -> Hardware Drivers I activated Broadcom STA wireless driver. My WiFi light turned on and I rebooted.
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