BCM4321 on Latitude D430
At kernel 3 find wireless hardware lspci | grep -i wireless check using current kernel module with PCI bus address lspci -vv -s 0c:00.0 If currently not using wl , add to blacklist all. vim /etc/modprobe.d/b4321-blacklist.conf blacklist ssb blacklist b43 blacklist bcma Install wl , apt install broadcom-sta-dkms