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So my wifi was disabled (I couldn't select the "enable wifi" option) and wouldn't automatically connect to wifi sometimes. I ran this command after reading that it did the trick for someone

sudo modprobe -rv wl
sudo apt-get remove --purge bcmwl-kernel-source
sudo modprobe -v brcmsmac

but now the option is gone altogether and it still won't connect! Any suggestions?

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Try with the applications and the drivers in this answer – user224082 Dec 20 '13 at 3:30

Have you check /etc/network/interfaces setting. I sometime lost enable wifi option by editing this file for some reason.

But you can use:

sudo ifup

For me wireless interface is wlan0 then I run.

sudo ifup wlan0

Issue ifconfig to list all your network interfaces.

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