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My wifi card worked fine earlier today. Now it does not work anymore. I also tried using an external USB wifi card and I got the same error:

kernel: wlan0: deauthenticating from x by local choice (reason=3)

I have tried restarting network (/etc/init.d/networking restart), unloading/reloading the wifi kernel modules, disabled and reenabled wifi in NetworkManager. None of these worked.

Ole Tange
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1 Answers1

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None of those kills wpa_supplicant (oddly enough: If I unload all wifi modules and disable wifi you would think wpa_supplicant would take the hint). So:

sudo killall wpa_supplicant

and then everything works.

Ole Tange
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    Why does this work? The solution was also posted [here](http://askubuntu.com/a/577827/289003) and links back to this answer, but no one has said why it works. (Unfortunately it didn't work for me) – Nateowami Feb 03 '16 at 12:30
  • I too would love to know why this works (but unlike @Nateowarmi it does work for me). A reboot doesn't fix it but this does, it's weird. – Damon Smith May 04 '16 at 05:01
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    http://www.xappsoftware.com/wordpress/2013/01/14/about-deauthenticating-from-by-local-choice-reason3/ suggests `sudo iwconfig wlan0 power off`, no idea if that kills wpa_supplicant as well – Nemo Sep 28 '17 at 10:10