If you are looking this up, you probably want a minimal install. To achieve this on Ubuntu 18.04 and beyond, you should select only OpenSSH Server, which contains 12 packages, as opposed to 151 packages in Basic Ubuntu Server.
And to add further clarity, the netinstall, mini.iso, Ubuntu Server ISO will all achieve exactly the same result.
Finally, with regard to kernels, 18.04 originally came out with kernel 18.104.22.168, now up to 22.214.171.124, signed as of September 2019. They also have a low latency version. Kernel 4.19 is a perfect kernel if you are on an Intel system with an NVIDIA GPU. It provides faster random disk access, but slower Intel CPU. This leaves kernel 5.2 out, since it is only good for Virtualization and AMD hardware.
Ubuntu 18.04.3 comes with kernel 5, which is mostly a big waste of time, except for AMD. Kernel 5.4 will be the first in the 5 series with a long term support. Because I will use QEMU, I will use 5.2 until 5.4. Otherwise, stick with 4.15 if using Intel and upgrade to 4.19.100 (whenever it gets there) or if on AMD use Kernel 5 included with Ubuntu 18.04.3 until 5.4.
Linux kernels. Complicated, yet simple stuff.