As far as I can tell this is fixed in Precise now, via running ifblacklist_migrate.sh properly during the install.
Closing as Fix Released. If you're running into such a bug again, please file a new bug report with the particular details, including /etc/network/interfaces. ** Changed in: network-manager (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/525411 Title: NetworkManager doesn't bring up onboard eth0 connection Status in “network-manager” package in Ubuntu: Fix Released Bug description: Binary package hint: network-manager I installed karmic from pxe boot/nfs livecd installer. After instalation NetworkManager was not able to manage eth0. Problem was that /etc/network(interface included entry for eth0 that was set for manaual configuration. This is probably installer bug but I have no idea how it should work. ProblemType: Bug Architecture: i386 CRDA: Error: [Errno 2] No such file or directory Date: Sun Feb 21 22:00:41 2010 DistroRelease: Ubuntu 9.10 Gconf: IfupdownConfig: auto lo iface lo inet loopback auto eth0 iface eth0 inet manual IpRoute: 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.163 default via 192.168.1.1 dev eth0 IwConfig: lo no wireless extensions. eth0 no wireless extensions. Package: network-manager 0.8~a~git.20091013t193206.679d548-0ubuntu1 ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash RfKill: SourcePackage: network-manager Uname: Linux 2.6.33-rc8 i686 XsessionErrors: (gnome-settings-daemon:2659): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed (gnome-settings-daemon:2659): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed (nautilus:2754): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed (polkit-gnome-authentication-agent-1:2776): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/525411/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp