Good time of day, comrads.

At home I've got access point asus rt-g32.
I installed ubuntu server 12.10 on my notebook. All my tries to configure networking (eth0 and wlan0) was unsuccessful via terminal.
After I installed gnome. From this moment strange moment begins:

if I connect to my notebook wired network from LAN port of Asus, and boot Ubuntu (and GNOME) - here we go, i see both LAN and Wifi. but connection is extremaly unstable (downloads may stall and starts again without reasons).
and if I DONT connect to my notebook wired network and boot, in echo I can see errors (boot without full network support).

Please help me to configure networking (wifi is preferred connection).