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Okay, I'm silly and didn't even remember my old tutorial. The additional drivers is part of Software Sources. More details in the old tutorial for Ubuntu 12.10.
For a lot of hardware drivers, Ubuntu will just automatically recognize what you have and have it all set up for you. Some proprietary drivers you may have to get working post-install.
There's a tool for this that in Ubuntu 13.04, unfortunately, through the graphical user interface (GUI) is a bit clunky to get up and running.
It also requires an active internet connection, so if the proprietary driver you need is for a Broadcom wireless card, you will need a wired connection in order for this to work.
Once the Ubuntu Software Center launches, search for additional driver in the search box at the top-right corner.
Click on More Info.
Find the driver you want to install, and then click Activate.
When it's finished installing, you may get a message saying the driver won't be useful until you reboot. You may not find this to be the case (e.g., your wireless connection may work without reboot), but you may actually have to reboot, depending on your situation.