I have this same problem with Ubuntu Gutsy Gibbon 7.10 beta with a Gigabyte P35 DS4 with rtl8111/8168B Gbit network card. I used the livecd -- dhcp doesn't work https://bugs.launchpad.net/bugs/135784 You received this bug notification because you are a member of Kubuntu Team, which is a bug contact for knetworkmanager in ubuntu.