Im not sure which kernel 5.0.1 comes with but there are kernel modules for the Intel Wireless 3945A/B chipset. These "drivers" are compiled against various archiectectures for a 2.6.18.1 kernel.

It will first be necessary to run apt-get update then use synaptic and search for all Intel drivers.
You also need to run uname -a to find which kernel you are running, as you may have to upgrade the kernel as well.