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[Bug 878882] [NEW] Networking disabled when eth0 disconnected during boot

 

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

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager-applet in Ubuntu.
https://bugs.launchpad.net/bugs/878882

Title:
  Networking disabled when eth0 disconnected during boot

Status in “network-manager-applet” package in Ubuntu:
  New

Bug description:
  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)

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References