I have the same problem. I need to deactivate and reactivate eth0 from Gnome networking prefs. There is my /etc/network/interafces :
auto lo eth0 iface lo inet loopback iface eth0 inet static address 192.168.1.102 netmask 255.255.255.0 gateway 192.168.1.1 wireless-essid kothlis wireless-mode managed -- network has to be started each time system is booted https://launchpad.net/bugs/50099 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
