how to install firmware for wifi when lan is not working

[Tapas Mishra]

>
> On Fri, Sep 16, 2011 at 3:42 PM, Abhishek Dixit <abhidixit87 at gmail.com>
> wrote:
>>
>> I recently installed Ubuntu 11.04 on my laptop.
>> Wireless is not working.
>> I do not have a lan card working  so as to  connect to it and use.Any
>> how I want to use the wifi so what do I need to install on it.
>> I will need to download any thing in the windows OS only (my laptop is
>> dual boot) and then install in Ubuntu.
>> So how should I go on.
>> lspci out put of my device is
>>
>> 0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312
>> 802.11b/g LP-PHY [14e4:4315] (rev 01)
>>        Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]
>>        Flags: bus master, fast devsel, latency 0, IRQ 17
>>        Memory at f69fc000 (64-bit, non-prefetchable) [size=16K]
>>        Capabilities: <access denied>
>>        Kernel driver in use: b43-pci-bridge
>>        Kernel modules: ssb
>>
>>
>>


On Fri, Sep 16, 2011 at 3:47 PM, Md Ashickur Rahman Noor
<ashickur.noor at gmail.com> wrote:
> Do you have windows? If you have then goto
> System-->Administration-->Hardware Drivers. You will see your hardware
> listed to install driver. Click the active button. Then it will give you a
> error message. There you will find the download link. Just download the file
> and install.
> ----------------------------------------------------------
>

I think he wants to know how to make wifi in Ubuntu work.He can access
internet in Windows what to do to make wifi work in Ubuntu ?