You have installed an extra module in the kernel. Haven't you ? If not, then maybe you also affected by another bug. Is not confirmed yet, but read here => https://bugs.launchpad.net/ubuntu/+s...l/+bug/1184095
Try first to remove the module and then install the kernel..
. This is only in order to install the latest mainline correctly and check if graphics card problem solved. Then you can install again the bcmwl-kernel-source package.Code:sudo apt-get purge bcmwl-kernel-source
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