What particular driver are you looking for? A graphics card? A network adapter? Please be more specific, that last response told us nothing. For the most part when you install ubuntu most drivers you need are included in the linux kernel. No need to download each piece of hardware's driver and install separately as in Windows. With laptops you may need to find a driver or two. Usually those can be found and downloaded from Additional drivers function in Ubuntu. But if that fails in order to find the driver you need to know what piece of hardware you need it for. So from the beginning...is ubuntu already installed? If yes what hardware is not working? If ubuntu is not installed boot from the Ubuntu Live CD/USB and try ubuntu. You will soon see if all hardware is working or not from the Live CD/USB.