[server] ubuntu server no wifi - broadcom BCM43224 (but worked during installer)

I have a working dual boot setup on my macbook air 5,2 with OSX Mavericks, Ubuntu 16.04 desktop. Wireless works fine.

Now I installed Ubuntu 16.04 Server on another partition. During installation, WIFI was detected but after installation and when I boot into the server, wifi isn't detected.

Here's the lspci output:

$ sudo lscpi -vv
02:00.0 Network controller [0280]: Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01)

What is the best way to get WIFI working? I don't have a wired coection.
Can I copy and install the wifi drivers from the working 'ubuntu desktop' partition?

Please help.