Ubuntu – How to get an Atheros AR9285 working

I've just decided to jump into the world of Ubuntu, so far I encountered no problems until I tried to connect to my wireless network. I'm running Ubuntu on my laptop, Acer Aspire 5333-2880, which has an Acer Nplify 802.11b/g/n wireless card.
After browsing for an answer, I think the problem is a missing driver.
input:

 lspci | grep Network

output:

02:00.0 Network controller; Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)

I found a couple of answers that might be right, but I have problems with both of them.

1. https://help.ubuntu.com/community/WifiDocs/Device/Atheros/AR9285 It requires me to load the site in my laptop, but I can't do it without internet and I have no idea how to save this into a USB.
2. http://linuxwireless.org/en/users/Download/stable/ But I have no idea how to really run or use this, and I wouldn't like to screw it up.

Any advice or other possible solutions will be greatly appreciated!

EDIT.

Thanks a lot for your input Marko and Jorge. I am sure the problem was with one of the drivers, but I was too distracted, or tired yesterday to realize I didn't restart my computer after installing. As soon as I got turned on my computer again, it was working. Annoyingly, I am not sure what the problem was exactly nor what exactly fixed it.

But still, thanks a lot Marko for the intel on how to build packages, I am sure it will be very useful later on!