[ubuntu] Loading graphic driver for intel atom n2600 processor

Hi there,

I got a question for a brand-new Ubuntu 12.04.03 LTS graphic installation, this embedded system ruing on top of Intel Atom N2600 CPU, and Intel NM10 intel chipset, also GMA 500
After a brand-new OS installation, I found the system is slow, and realized only the basic graphic driver installed, the currently resolution is only (800*600).
Below steps is what I tried so far but has no luck to get it work.

1. I downloaded the Intel graphic installer for LINUX from 01.org, it installed successfully, but tells me that "You don't seem to have an Intel i915 chipset so no update are needed".
2. Type command ""Sudo lshw -c video | grep 'configuration' " in term, I got below
configuration: driver=gma500 latency=0
3. Try find gma500 linux driver but I got nothing.

Does anyone know how to install this driver?
Thanks.

Adam