$lspci -knn | grep Net -A3; rfkill list
03:00.0 Network controller [0280]: Broadcom Limited BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03)
    Subsystem: AzureWave BCM4352 802.11ac Wireless Network Adapter [1a3b:2123]
    Kernel driver in use: bcma-pci-bridge
    Kernel modules: bcma
0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

$ sudo apt-get update
$ sudo apt-get install bcmwl-kernel-source

Need to get 0 B/28.4 MB of archives.
After this operation, 125 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Media change: please insert the disc labeled
 'Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)'
in the drive '/media/cdrom/' and press [Enter]