Ubuntu – WiFi problem after Ubuntu 12.10 update

Ubuntu – WiFi problem after Ubuntu 12.10 update


I just updated my Ubuntu 12.10 today and it went fine and I was told to restart system and after I restart my WiFi stopped working. Mine is Broadcom BCM4312 card . It was working fine just before the update, I tried reinstalling driver from software sources and it didn’t work, it shows the proprietary driver in use but network manager doesn’t detect my WiFi card.

Best Answer

  • I just fixed the issue, I found the kernel sources has not been installed which prevented from compiling the driver properly. So I installed kernel source for the current kernel from Synaptic then issued the following commands and my WiFi was instantly restored (like 3 or 5 seconds).

    To install kernel headers and source:

     sudo apt-get install linux linux-headers-generic kernel-package
     sudo apt-get purge b43-fwcutter firmware-b43-installer firmware-b43-lpphy-installer firmware-b43legacy-installer bcmwl*
     sudo apt-get install b43-fwcutter firmware-b43-lpphy-installer bcmwl*

    Then reboot.

    This applies to BCM4312 only (My laptop is Lenovo g450)

    For others can see this blog post, this might be useful for you.

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