There are several ways of doing this. You can download the Atheros driver source and compile, but this is by far the simplest since you only have to download the deb package and install to get your wireless network to work and do the rest while connected. Here is how:
Download your kernel’s Linux backports modules from here – mine was 2.6.28-11 generic. If you don’t know what your kernel version is use “uname -r” in console. Note that installing the wrong build can break your package manager and cause more frustration, so be careful. Copy the file to a flash drive and install it on the Eee. Reboot and your wireless NIC should work.
sudo dpkg -i linux-backports-modules-2.6.28-11-generic_2.6.28-11.12_i386.deb
Once your wireless connection is up and running, connect to the Internet, fire up Synaptic Package Manager and search for “eee”. You will see a package called “atl2-source” which is your Linux base driver for Atheros Ethernet Controller. Install, reboot and your wired network controller should also work. You can also run the following command in console instead of using Synaptic:
sudo aptitude atl2-source
There are a few more packages for Eee-PC in Synaptic… Make sure to install the ACPI driver.