network-manager does not manage wired network, no ip address on eth0

[Sziráki Tamás]

Binary package hint: network-manager

At my home I have cable modem and a router, and I had automatic wired network, when my pc plugged in by wire. Yesterday a another place where dsl connection and a router are there, a connected to router by wire and with pppoeconf to dsl modem. At one moment I realized the nm-applet on panel says: "Wired network is not managed", and I cannot connect to router by wire or to my cable modem. The connection through pppoe and wifi works. In ifconfig there is no ip address on eth0. Before the Karmic Koala 9.10 the same issue occured, but installing the wicd packages the wired connections worked well.

ProblemType: Bug
Architecture: i386
CRDA: Error: [Errno 2] Nincs ilyen fájl vagy könyvtár
Date: Thu Apr 29 08:50:41 2010
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
IpRoute:
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.100 metric 2
 169.254.0.0/16 dev eth0 proto kernel scope link src 169.254.9.157
 default via 192.168.1.1 dev wlan0 proto static
Package: network-manager 0.8~a~git.20091013t193206.679d548-0ubuntu1
ProcEnviron:
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-21.59-generic
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: network-manager
Uname: Linux 2.6.31-21-generic i686

[ororo (ororo)]

I have a similar issue.
The problem (in my case) is that pppoeconf modifies the file /etc/network/interfaces, adding the lines:

auto eth0
iface eth0 inet manual

so that network-manager stops to handle eth0.
I commented these two lines, and network-manager works again.

[Thomas Hood (jdthood)]

pppoeconf shouldn't do this.