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.
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)