ROS Noetic requires an Ubuntu 20.04. An easy way to do this is to create a virtual machine. Download the VirtualBox app as well as the 20.04 ubuntu desktop.
In Virtual box, click the create new VM button, and make sure the bellow requirements are set before completing.
settings/system/processor
. Change the CPU amount from 1 CPU to 2-4settings/Network
and change from NAT to Bridged Adapter to set up internet.