Comment 8 for bug 1572659

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Torsten Gilles (torsten-gilles) wrote : Re: bcmwl driver does not work with kernel 4.4.0-21

The same issue exists when using the broadcom-sta-dkms package instead of bcmwl-kernel-source on kernel 4.4.0-21 (also as with bcmwl-kernel-source this packages works on kernel-4.4.0-18):
The loading of the module fails with modprobe: ERROR: could not insert 'wl': Required key not available. The reason seems to be because of insufficient privileges for some underlying action.