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[Matthew Mattoon <867833@xxxxxxxxxxxxxxxxxx>]

This issue also affects me.  Quick and dirty reproduction steps.

1) Remove all network configuration from Network Manager.
2) Manually define a static or dhcp address in /etc/network/interfaces
3) Restart networking /etc/init.d/networking restart
4) Manually define /etc/resolv.conf for your environment
5) Restart NetworkManager /etc/init.d/network-manager restart (you can also reboot your system if you prefer)

Your /etc/resolv.conf has now been overwritten.

I also tried unchecking "Enable Wired Networking" in Network Manager and
configuring using the above config files and the same behavior occurred.

This causes problems with regards to specific network configurations
(bridges, vlans) which I personally use for KVM.

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https://bugs.launchpad.net/bugs/867833

Title:
  Network Manager overwriting /etc/resolv.conf with no information when
  static IP configured for ipv4

Status in “network-manager” package in Ubuntu:
  Confirmed

Bug description:
  After a reboot, /etc/resolv.conf is blank and only contains the line

  # Generated by NetworkManager

  The computer is configured for a static IP address using (in XFCE)
  Settings -> Network Connections and contains a valid DNS entry.

  In order for the computer to access the internet, I must edit /etc/resolv.conf and insert
  nameserver 8.8.8.8

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: network-manager 0.9.1.90-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-10.16-server 3.0.4
  Uname: Linux 3.0.0-10-server x86_64
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  CRDA: Error: [Errno 2] No such file or directory
  Date: Tue Oct  4 14:48:03 2011
  Gconf:
   
  InstallationMedia: Ubuntu-Server 11.04 "Natty Narwhal" - Release amd64 (20110426)
  IpRoute:
   default via 192.168.10.1 dev eth0  metric 100 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.10.0/24 dev eth0  proto kernel  scope link  src 192.168.10.11
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  Keyfiles: Error: [Errno 2] No such file or directory
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
  RfKill:
   
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to oneiric on 2011-09-05 (29 days ago)

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