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I'm using Backtrack5R3 via bootable CD and getting no wireless interface found output. These are the o/p of commands by which you can get details of my problem. My laptop model is Lenovo b490(20205).

root@bt:~# iwconfig
    lo        no wireless extensions.

    eth0      no wireless extensions.

root@bt:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 3c:97:0e:8d:ef:29  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:42 Base address:0x6000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:69 errors:0 dropped:0 overruns:0 frame:0
          TX packets:69 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:15785 (15.7 KB)  TX bytes:15785 (15.7 KB)

root@bt:~# airmon-ng


Interface   Chipset     Driver


    root@bt:~# lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:14.0 USB Controller: Intel Corporation Panther Point USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04)
00:1a.0 USB Controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 2 (rev c4)
00:1c.3 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 4 (rev c4)
00:1d.0 USB Controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)
02:00.0 Network controller: Broadcom Corporation Device 4365 (rev 01)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 07)

root@bt:~# lshw -c network
  *-network UNCLAIMED     
       description: Network controller
       product: Broadcom Corporation
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 01
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:f0500000-f0507fff
  *-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: eth0
       version: 07
       serial: 3c:97:0e:8d:ef:29
       size: 10MB/s
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8168e-3.fw latency=0 link=no multicast=yes port=MII speed=10MB/s
       resources: irq:42 ioport:2000(size=256) memory:f0404000-f0404fff memory:f0400000-f0403fff

Let me know if you require more details.

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2  
You need the bcm43142 driver (found via Google broadcom 4365, which comes from your lspci). Not sure exactly how to do that on your distro though... Just leaving a pointer here. –  derobert Mar 31 at 17:41
    
I have downloaded the required driver --> wireless-bcm43142-dkms_6.20.55.19-1_amd64.deb but i dont know the commands to install this driver. please guide. –  Jerry Goyal Mar 31 at 17:46
    
It's probably just dpkg -i wireless-bcm43142-dkms_6.20.55.19-1_amd64.deb, assuming you have the dependencies installed. If not, it'll complain, and you can use aptitude/apt-get/etc. to install them. Make sure to have the kernel-headers package installed for your kernel as well. –  derobert Mar 31 at 17:49
    
root@bt:~# dpkg -i wireless-bcm43142-dkms_6.20.55.19-1_amd64.deb gives o/p -> package architecture (amd64) does not match system (i386) then i googled and got this file root@bt:~# dpkg -i dkms_2.2.0.3-1.1ubuntu4_all.deb (Reading database ... 267024 files and directories currently installed.) Preparing to replace dkms 2.2.0.3-1.1ubuntu4 (using dkms_2.2.0.3-1.1ubuntu4_all.deb) ... Unpacking replacement dkms ... Setting up dkms (2.2.0.3-1.1ubuntu4) ... Processing triggers for man-db ... root@bt:~# what's now? –  Jerry Goyal Mar 31 at 19:17
    
Sounds like you need to find an i386 version of the driver (instead of amd64). –  derobert Mar 31 at 19:21
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