Changing device under Ubuntu

[Chuang Wu]

>Google says that it should work with the e1000 kernel module.  Try running:
>lsmod | grep e1000
> to see if it's already loaded.  If it's not, then
> sudo modprobe e1000

Thanks, when running 'lsmod | grep e1000', it shows e1000 module is
already loaded. And in dmesg, there's a section about e1000 too.
---
[17179582.680000] Intel(R) PRO/1000 Network Driver - version 7.0.33-k2
...
[17179582.968000] e1000: 0000:02:01.0: e1000_probe: (PCI:33MHz:32-bit)
00:16:41:52:68:08
[17179583.004000] e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
---
but 'ifconfig' cannot find eth0 device either ;'( It sounds so weird. Any ideas?
Thanks