I initially loaded Ubuntu with no USB ports installed in my machine. I have now added a USB 2.0 port to the machine but I don't know how to get Ubuntu to recognize it. How do I get the support for USB added into the kernel?
There is no need to do that. The kernel of Ubuntu is a fixed set of modules and all modules (which aren't already compiled into the kernel) are loaded as needed.
If your USB-Ports are not working, then there's another problem with them, and not Ubuntu not finding them.
If the port is installed right, use the
How do you know the USB port isn't being recognized? Did you try plugging any USB devices into it? Most likely it's a problem with the device and not the port.
Also, how did you add the port? Is this a desktop, and you added a PCI or PCIe card?