`modprobe` - add a kernel module

modprobe MODULE

Examples

$ sudo modprobe br_netfilter

now; list it in /etc/modules-load.d/k8s.conf for the next boot

Gotchas

Like sysctl -w, modprobe does not survive a reboot on its own.

Try modprobe in a real terminal Free, in your browser - a real Ubuntu terminal to try it in, with missions that check your work.