Since I have a laptop now, I install Debian on it right now of course.
At first, I use Debian stable version's ISO. But it cannt recognize the ethernet card. What a pity. No ethernet, no network; no network, no everything...
Then I try a Kubuntu. It works quite well.
But I really like Debian, so I download a testing ISO. The amazing is the ethernet works when installation while it doesnt exist after installation finished.
Oh, puzzled.
Later, I check the /var/log/syslog, it says UDEV rename eth0 as eth1 and let it down. And the result is clear: ifconfig eth1 up

