Public bug reported:

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> 
About Ubuntu
Description:    Ubuntu 12.04.1 LTS
Release:        12.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or 
by checking in Software Center
network-manager:
  Installed: 0.9.4.0-0ubuntu4.1
  Candidate: 0.9.4.0-0ubuntu4.1
  Version table:
 *** 0.9.4.0-0ubuntu4.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     0.9.4.0-0ubuntu3 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

3) What you expected to happen
plug ethernet in and have internet

4) What happened instead
No wired internet connection
what happened: No wired internet connection


After installing Ubuntu 12.04 using my wireless connection I was unable to just 
plug in my ethernet and have that work. Instead, after some research and 
guessing, I found that it had to be turned on using sudo ifconfig eth0 up. This 
is not user-friendly and must be fixed. Here is the relevant thread: 
http://ubuntuforums.org/showthread.php?t=2050194


08:00.0 Ethernet controller: Atheros Communications Inc. AR8152 v1.1 Fast 
Ethernet (rev c1)
    Subsystem: Toshiba America Info Systems Device fd50
    Flags: bus master, fast devsel, latency 0, IRQ 44
    Memory at f3000000 (64-bit, non-prefetchable) [size=256K]
    I/O ports at 6000 [size=128]
    Capabilities: [40] Power Management version 3
    Capabilities: [48] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [58] Express Endpoint, MSI 00
    Capabilities: [6c] Vital Product Data
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [180] Device Serial Number ff-3f-b4-bc-60-eb-69-ff
    Kernel driver in use: atl1c
    Kernel modules: atl1c

If you have any questions please ask.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.4.0-0ubuntu4.1
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
Date: Thu Aug 30 20:17:30 2012
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
IpRoute:
 default via 192.168.254.254 dev wlan0  proto static 
 169.254.0.0/16 dev wlan0  scope link  metric 1000 
 192.168.254.0/24 dev wlan0  proto kernel  scope link  src 192.168.254.106  
metric 2
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RfKill:
 0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE     TYPE              STATE         DBUS-PATH                           
       
 eth0       802-3-ethernet    unavailable   
/org/freedesktop/NetworkManager/Devices/1  
 wlan0      802-11-wireless   connected     
/org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI  
     WWAN-HARDWARE   WWAN      
 running         0.9.4.0    connected       enabled       enabled         
enabled    enabled         enabled

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise running-unity

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https://bugs.launchpad.net/bugs/1044136

Title:
  eth0 Down/Disabled When Ubuntu Is Installed With Only Wireless

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