sudo apt-get purge bcmwl-kernel-source sudo apt-get install broadcom-sta-dkms
works for me as it was described in https://bugs.launchpad.net/ubuntu/+source/broadcom-sta/+bug/1777444?comments=all
sudo apt-get purge bcmwl-kernel-source
sudo apt-get install broadcom-sta-dkms
works for me as it was described in https:/ /bugs.launchpad .net/ubuntu/ +source/ broadcom- sta/+bug/ 1777444? comments= all