Public bug reported:
If I boot with the ethernet cable disconnected, all networking including
WiFi is disabled and cannot be enabled. If I boot with the cable
connected, both the cable and wifi work properly, even if I disconnect
and reconnect either.
Workaround: I put the lines below into /etc/network/interfaces
allow-hotplug eth0
iface eth0 inet dhcp
When these lines are there, I can't use the wired connection at all, but
wifi works properly. For me, this is preferable since I rarely used the
ethernet cable.
History: I first installed 10.10, then updated to 11.4 in May or so.
After that, I'm not sure if immediately, the eth0 port was unusable
unless I booted with a cable attached. Since the wifi port worked fine
in either case, this wasn't a big problem for me. In August or
September, the behavior changed to the current in which the network is
completely unusable unless I boot with the cable. I thought updating to
11.10 would fix this, but it hasn't. Also possibly related, when I
updated to 11.10, during the update process, I was informed that Samba
failed to install. I haven't used Samba since the update, but it
definitely worked before.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: network-manager-gnome 0.9.1.90-0ubuntu6
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CRDA: Error: [Errno 2] No such file or directory
Date: Thu Oct 20 09:40:38 2011
IfupdownConfig:
auto lo
iface lo inet loopback
allow-hotplug eth0
iface eth0 inet dhcp
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
IpRoute:
default via 192.168.1.1 dev wlan0 proto static
169.254.0.0/16 dev wlan0 scope link metric 1000
192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.234 metric 2
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
ProcEnviron:
LANGUAGE=en
PATH=(custom, user)
LANG=en_AU.utf8
SHELL=/bin/bash
SourcePackage: network-manager-applet
UpgradeStatus: Upgraded to oneiric on 2011-10-16 (3 days ago)
** Affects: network-manager-applet (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric
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https://bugs.launchpad.net/bugs/878882
Title:
Networking disabled when eth0 disconnected during boot
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