working wireless card stopped working on previously working wireless Ubuntu 11.04

[Abhishek Dixit]

On Sun, Jan 15, 2012 at 4:40 PM, Colin Law <clanlaw at googlemail.com> wrote:
> On 15 January 2012 04:04, Abhishek Dixit <abhidixit87 at gmail.com> wrote:
>> I have a Dell Laptop on which wireless and every thing used to work
>> perfectly.Today morning I noticed the suddenly there is no wireless at
>> all. On a working condition I used to have folllowing
>>
>> lspci -vnn
>>
>> 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: wl
>>    Kernel modules: wl, ssb
>> and
>>
>> /etc/lsb-release
>> Ubuntu 11.04 64 bit
>> Module in use was wl.ko But now all of a sudden it fails to load any
>> module for wireless.I have no idea why this happened.I am a SOHO user
>> who does not have any thing other than web surfing and multimedia to
>> do on this machine.I even booted from a Live USB but still wireless
>> here failed to work (prior to installation same Live USB was able to
>> detect the wifi card and wireless worked with this live USB). The
>> driver in use was found on the LIVE cd at following location
>>
>> pool/restricted/b/bcmwl/bcmwl-kernel-source_5.100.82.38+bdcom-0ubuntu3_amd64.deb
>> which used to show as additional drivers available for
>> installation.Now this option even does not come when I boot with this
>> Live USB.Since the installation of Ubuntu I have kept this Live USB as
>> a backup. Can some one help here?
>
> If it no longer works with the live USB, but used to, and you have not
> changed anything on the USB stick then it must be a change on the
> laptop hardware or bios.  I presume that if there is a hardware switch
> that it is switched on.  Check in the BIOS settings that it has not
> got switched off there.  Is it setup for dual boot with windows?  If
> so does it work there?
>
It is not a dual boot system.There is only Ubuntu 11.04 now I
formatted it completely with 11.10 but the same situation persists.