I have issues with wifi driver on my Kubuntu 16.04. bcmwl works fine with 4.4.0-31-generic (the oldest version of kernel on my system), but when kernel updates to different version list of wifi connections disappears. Previously i've fixed this by loading 4.4.0-31-generic and reinstalling bcmwl-kernel-source from pool on Ubuntu installation stick. After reboot on newer kernel version Wifi worked like a charm, but now this trick did not work. I thought about restricting dkms to rebuild bcmwl during the upgrade, but do not know how to do it. Any ideas how to fix this?
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Probably the problem is in UEFI Secure Boot. – Pilot6 Jan 13 '17 at 09:22
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1Possible duplicate of Why do I get "Required key not available" when install 3rd party kernel modules or after a kernel upgrade? – Pilot6 Jan 13 '17 at 09:23
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Maybe the issue is about that kernel in particular? Why don't you try updating to the latest kernels? like 4.8 or 4.9? The application: Ukuu (Ukuu kernel update utility)
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