sach@laptop:~$ sudo apt-get install bcmwl-kernel-source dkms
[sudo] password for sachil:
Reading package lists... Done
Building dependency tree
Reading state information... Done
dkms is already the newest version.
dkms set to manually installed.
bcmwl-kernel-source is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.