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You need to install firmware-b43-installer. If you do not have an alternative internet connection, do it this way. If you installed bcmwl-kernel-source, then remove it. sudo apt-get purge bcmwl-kernel-source Download these files http://mirrors.kernel.org/ubuntu/pool/main/b/b43-fwcutter/b43-fwcutter_015-9_amd64.deb ...
The correct driver for your device, wl, has gone missing. Let's try to reinstall it: sudo apt-get update sudo apt-get install --reinstall bcmwl-kernel-source sudo modprobe wl Please post any errors, warnings, etc. We see this: Module build for the currently running kernel was skipped since the kernel source for this kernel does not seem to be ...
You need to update kernel and headers first. Run in terminal sudo apt-get install linux-generic Reboot and run: sudo apt-get install --reinstall bcmwl-kernel-source
I had similar issue with this for BCM4352 and been compiling drivers for each new kernel. Until one day, I've found out that in "Software & Updates" you have magical tab "Additional drivers". Just select alternative, proprietary drivers and you should be fine. In case above doesn't give anything to choose from, here's manual way to make it working. ...
Please get a temporary internet connection by ethernet, tethered or wahtever means possible, open a terminal and do: sudo apt-get update sudo apt-get install bcmwl-kernel-source Reboot and your wireless should be working.
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