nx9010@nx9010-HP-nx9010-DJ316A:~$ sudo apt install bcmwl-kernel-source
Reading package lists... Done
Building dependency tree        
Reading state information... Done
bcmwl-kernel-source is already the newest version (6.30.223.271+bdcom-0ubuntu1~1.1).
The following packages were automatically installed and are no longer required:
  linux-headers-4.4.0-21 linux-headers-4.4.0-21-generic
  linux-image-4.4.0-21-generic linux-image-extra-4.4.0-21-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
nx9010@nx9010-HP-nx9010-DJ316A:~$