Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I have been using wireless seamlessly since I upgraded to Ubuntu 12.04 LTS. I did a botched attempt of installing Octave 3.6, at that time I was connected via Ethernet. I postponed that installation till later, but when I went home and tried to connect to a wireless network realized that Ubuntu is not detecting the wireless adapter..the blue light did not come up even after toggling hardware key. On booting into windows OS I was able to confirm that the adopter is working and I could connect to wireless network. Since then I have tried a number of things including re-installing BCM drivers as mentioned on other threads but nothing worked.

Here is the current status of my machine and wireless adapter....

 lspci -v 

0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

Subsystem: Dell Wireless 1397 WLAN Mini-Card

Flags: bus master, fast devsel, latency 0, IRQ 3

Memory at f69fc000 (64-bit, non-prefetchable) [size=16K]

Capabilities: <access denied>
Kernel modules: ssb

    lsmod

Module                  Size  Used by

ip6table_filter        12815  0 

ip6_tables             27864  1 ip6table_filter

iptable_filter         12810  0 

ip_tables              27473  1 iptable_filter

x_tables               29891  4 ip6table_filter,ip6_tables,iptable_filter,ip_tables

vesafb                 13844  1 

parport_pc             32866  0 

ppdev                  17113  0 

rfcomm                 42651  0 

lp                     17799  0 

parport                46562  3 parport_pc,ppdev,lp

bnep                   18139  2 

joydev                 17693  0 

bluetooth             205289  10 rfcomm,bnep

binfmt_misc            17540  1 

nfsd                  277884  2 

nfs                   356377  0 

lockd                  90326  2 nfsd,nfs

fscache                61568  1 nfs

auth_rpcgss            53380  2 nfsd,nfs

nfs_acl                12883  2 nfsd,nfs

sunrpc                241772  6 nfsd,nfs,lockd,auth_rpcgss,nfs_acl

psmouse                97485  0 

serio_raw              13211  0 

video                  19596  0 

compat                 20099  3 rfcomm,bnep,bluetooth

e1000e                156715  0 

    lshw -C network 

*-network UNCLAIMED

description: Network controller

product: BCM4312 802.11b/g LP-PHY

vendor: Broadcom Corporation

physical id: 0

bus info: pci@0000:0c:00.0

version: 01

width: 64 bits

clock: 33MHz

capabilities: pm msi pciexpress bus_master cap_list

configuration: latency=0

resources: memory:f69fc000-f69fffff

    uname -a

Linux ubuntu 3.2.0-35-virtual #55-Ubuntu SMP Wed Dec 5 18:02:05 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

    sudo modprobe wl
FATAL: Module wl not found.

Thanks in advance for any help.

  • UPDATE

After trying the answer below: fsheikh@ubuntu:~$ sudo apt-get remove --purge bcmwl-kernel-source Reading package lists... Done Building dependency tree
Reading state information... Done Package bcmwl-kernel-source is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

fsheikh@ubuntu:~$ sudo apt-get install firmware-b43-lpphy-installer 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
firmware-b43-lpphy-installer is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

fsheikh@ubuntu:~$ sudo modprobe b43
WARNING: Error inserting bcma (/lib/modules/3.2.0-35-virtual/updates/cw-3.6  /bcma.ko): Unknown symbol in module, or unknown parameter (see dmesg)
WARNING: Error inserting cfg80211 (/lib/modules/3.2.0-35-virtual/updates/cw-3.6/cfg80211.ko): Unknown symbol in module, or unknown parameter (see dmesg)
WARNING: Error inserting mac80211 (/lib/modules/3.2.0-35-virtual/updates/cw-3.6/mac80211.ko): Unknown symbol in module, or unknown parameter (see dmesg)
FATAL: Error inserting b43 (/lib/modules/3.2.0-35-virtual/updates/cw-3.6/b43.ko): Unknown symbol in module, or unknown parameter (see dmesg) 
share|improve this question
    
Please see: askubuntu.com/questions/223900/… –  chili555 Jan 11 '13 at 13:32
    
Thanks chilli555... But after sudo modprobe wl ...I get FATAL: Error inserting wl (/lib/modules/3.2.0-35-virtual/updates/dkms/wl.ko): Invalid argument –  fsheikh Jan 11 '13 at 13:45
    
Did you install the headers and re-install bcmwl-kernel-source? –  chili555 Jan 11 '13 at 16:40
    
Yes I did. Both command executed correctly just that there was a locale warning while reinstalling bcmwl-kernel-source. Nothing serious I guess, so I rebooted. Currently systems setting shows a bcm43 driver activated but not used. Reading elseware I also used synaptic to remove linux-backport-wireless-cw packages, and then I am back to square one. –  fsheikh Jan 11 '13 at 18:02
    
Let's see: dmesg | grep -e wl -e b43. Also: lspci -nn | grep 0280. –  chili555 Jan 11 '13 at 19:12
show 2 more comments

2 Answers 2

up vote 1 down vote accepted

Never remember opting for virtual kernel with Ubuntu 12.04LTS. Coupled this with the fact that wireless was working before, I used synaptic to remove all virtual kernel headers, image and library packages. Guess what WiFI started working with no additional installation, etc. However it seems I have messed up my lightdm installation now but that is a subject for another thread.

Thanks chili555 for your help though.

share|improve this answer
add comment

Please try, with a temporary ethernet connection:

sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get install firmware-b43-lpphy-installer
sudo modprobe b43

Reference: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1030503

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.