Essential hardware – installing necessary drivers
Drivers are the necessary packages necessary to allow you to use your hardware. For example, for wireless networking to work, there needs to be a driver that supports the Wi-Fi device on your computer. Usually, these are included in Ubuntu and require no additional steps for you to install or enable them.
You may have hardware that doesn’t have an open source driver, which may require some extra steps to install. A common example of this is an NVIDIA graphics card. During the installation process, there was an Optimize Your Computer screen; if you checked the box to allow installation of proprietary software and you have an NVIDIA graphics card, the installer would have automatically installed the appropriate driver. However, if not, or you want to switch which version of the driver you are using, you can use the Additional Drivers tool:

Figure 4.28 – Additional Drivers
The Additional Drivers...