To enable Linux USB support, first go inside the "USB support" section and enable the "Support for USB" option. While that step is fairly obvious, the following Linux USB setup steps can be confusing. In particular, you now need to select the proper USB host controller driver for your system. Your options are "EHCI," "UHCI," "UHCI (alternate driver)," and "OHCI." This is where a lot of people start getting confused about USB for Linux.