Ubuntu – No wired or wireless networking available on Ubuntu 12.04 (wired work from LiveUSB)

12.04networkingwiredwireless

I've just installed 12.04 in a dual boot with Vista via a LiveUSB. When I booted to the LiveUSB wired networking worked out of the box, and wireless networking didn't work. Now that I've installed 12.04 on a partition on the harddrive I can't get wired or wireless networking to work.

Any suggestions as how to how I should go about fixing this? The output of sudo lshw -C network is:

  *-network
       description: Network controller
       product: BCM4311 802.11b/g WLAN
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:0c:00.0
       version: 01
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=wl latency=0
       resources: irq:17 memory:fe8fc000-fe8fffff
  *-network UNCLAIMED
       description: Ethernet controller
       product: BCM4401-B0 100Base-TX
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       version: 02
       width: 32 bits
       clock: 33MHz
       capabilities: pm cap_list
       configuration: latency=64
       resources: memory:fe5fe000-fe5fffff

Best Answer

  • Additional Drivers sometimes offers to install the wrong drivers! Please open a terminal and do:

    sudo apt-get remove --purge bcmwl-kernel-source
    sudo modprobe b44
    

    Now your ethernet should be working. Hook it up and do:

    sudo apt-get install linux-firmware-nonfree
    

    Upon reboot, both should be working fine.

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