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$ iwconfig

lo        no wireless extensions.

eth0      no wireless extensions.

$ ifconfig -a

eth0      Link encap:Ethernet  HWaddr 70:5a:b6:08:b3:21  
          inet addr:192.168.1.25  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::725a:b6ff:fe08:b321/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:15337 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11030 errors:0 dropped:0 overruns:0 carrier:5
          collisions:0 txqueuelen:1000 
          RX bytes:8673692 (8.6 MB)  TX bytes:1339434 (1.3 MB)

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:65536  Metric:1
          RX packets:8288 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8288 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:787813 (787.8 KB)  TX bytes:787813 (787.8 KB)

But lspci sees the Broadcom device:

$ lspci

00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] RS780/RS880 PCI to PCI bridge (int gfx)
00:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 0)
00:05.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 1)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode]
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.1 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0 USB OHCI1 Controller
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 SMBus Controller (rev 3c)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 LPC host controller
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 PCI to PCI Bridge
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS780M [Mobility Radeon HD 3200]
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
08:00.0 Ethernet controller: Qualcomm Atheros AR8132 Fast Ethernet (rev c0)

How can I fix this?

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possible duplicate of Installing Broadcom Wireless Drivers –  Eric Carvalho Jun 16 at 17:07

1 Answer 1

up vote 2 down vote accepted

I have seen some users with the same card having the same problem (Installing Broadcom Wireless Drivers)

A known issue is that jockey; also known as Additional Drivers, suggests the wrong driver for a few Broadcom cards.

Please open a terminal and run and post:

sudo apt-get install --reinstall bcmwl-kernel-source

After it's done, do:

sudo modprobe wl 

If there is no error or warning, your wireless should be working.

OP indicates that an additional step was required to get this solution working. See below

After following all of the steps here, I had to additionally install the b43 firmware package like so:

sudo apt-get install firmware-b43-installer

Then it worked after a reboot.

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1  
@Oldschool-Aspire-5517:~$ lspci -nnk | grep -iA2 net 02:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Subsystem: Foxconn International, Inc. T77H106.00 Wireless Half-size Mini PCIe Card [105b:e01b] Kernel driver in use: b43-pci-bridge 08:00.0 Ethernet controller [0200]: Qualcomm Atheros AR8132 Fast Ethernet [1969:1062] (rev c0) Subsystem: Acer Incorporated [ALI] Device [1025:028d] Kernel driver in use: atl1c –  Chip Douglas May 15 at 20:42
    
After running your previous suggestion: $ sudo cat /var/log/syslog | grep -e wl -e firmware -e wlan0 | tail -n35 I got information on firmware that was needed. –  Chip Douglas May 15 at 21:10
    
The output of your commands gives me the idea that this seems to be the same situation as some users before as I said. askubuntu.com/questions/213550/… Should be helpful. –  Mr_Chmod May 15 at 21:59
    
Please do what is in the accepted answer in the link below so we may see the information needed to help diagnose the issue. <askubuntu.com/questions/425155/…; –  Wild Man May 16 at 0:18

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