Ubuntu 18.04. 4 ships with a v5. 3 based Linux kernel updated from the v5. 0 based kernel in 18.04.

What Linux kernel is Ubuntu?

so I conclude that Ubuntu 18.04 comes with Linux kernel 4.15. And by searching for linux-image- in that page, we find several kernels that can be installed in the system.

Which kernel is used in Linux?

The Linux® kernel is the main component of a Linux operating system (OS) and is the core interface between a computer’s hardware and its processes. It communicates between the 2, managing resources as efficiently as possible.