Graphic card drivers

[WeldonJ92]

I am a new user of Ubuntu and have very little understanding of how it works.

I have installed Ubuntu 12.10.
I am running Ubuntu 12.10 on a HP Pavilion G6.
The graphic card this laptop uses is a AMD Radeon HD 6480G.
Ubuntu is not using the graphic card driver that it should be.
Instead I think it is using 'vesa', which I think is a very low 2D-specific graphic driver.

I have already searched for how to install this.

I know how to open the 'terminal' and I know that sudo is something about installing and that sometimes I am prompted for a password.

If someone knows how to install these drivers, that would be brilliant.
I would like to use Ubuntu, however if these drivers won't install, then I can't. :/

Thanks a lot!

- Jake.

Edit:
A website said that my graphic driver was something else, which I did eventually install I think, but then Ubuntu would not boot and would hang at a black screen with a blinking white cursor. I then booted Ubuntu in graphic safe mode, but this did not work either.
I then found information suggesting that my graphic driver is something other than what a website had said.
Since then I have uninstalled Ubuntu and installed a fresh copy of Ubuntu.
I have not changed anything within this copy of Ubuntu and am waiting for someone more knowledgeable than myself to explain.