I built my own computer about a month ago and loaded Windows 7 on it, and then decided to put Ubuntu 12.04 on instead. It doesn't recognize my ethernet cable, and I cannot get any internet what-so-ever. I would like to know which drivers to download. I have 32-bit, if that helps. I do have an external HDD that I can transfer between computers with. Thank you in advanced.
When did you download the CD image? If this was over a week ago, then downloading and installing the latest 12.04 point release (12.04.2, released on Feb 14) is probably the simplest solution in your situation.
From 12.04.2 onward, the LTS releases will run on more recent kernels. Their LTS Enablement Stack will keep the kernel and X stack in sync with stable versions from newer releases (Quantal, Raring, S). Quantal's kernel (3.5.0) has built-in support for the alx driver, which is what you need.
For those currently on 12.04 LTS: updating from 12.04.1 or 12.04 will not enable the LTS Enablement Stack. To do this, install the linux-generic-lts-quantal and/or xserver-xorg-lts-quantal packages.
apt-get update apt-get install linux-generic-lts-quantal
... was all I needed to do to get my Atheros AR8162 working.
Go to Settings > Additional Drivers
Wait a minute the system will being update the repository
Then, all support drivers in Ubuntu will be available in list
Choose and install the driver based on the device
If your device that you mean not shown on the list, it's possible your device is not supported for Ubuntu 12.04