Public bug reported:

$ cat /etc/resolv.conf 
# Generated by NetworkManager
domain langfeldt.net
search langfeldt.net
nameserver 192.168.1.1


man resolv.conf:

       The domain and search keywords are mutually exclusive.  If more than  
one  instance  of  these  keywords  is
       present, the last instance wins.

To avoid surprising people that don't know better (or changes in
named.conf) and to observe the Robustness principle
(http://en.wikipedia.org/wiki/Robustness_principle) or some unintended
change in which instance of the keywords that win, the file should
probably only use one of those.  The DHCP option in question  here is
setting the dns domain and so the domain line should be generated. I
have been told that there now is a DHCP option for the search line as
well.  But in any case they should not both be generated.

Regards,
  Nicolai

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.4.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CRDA:
 country NO:
        (2402 - 2482 @ 40), (N/A, 20)
        (5170 - 5250 @ 40), (N/A, 20)
        (5250 - 5330 @ 40), (N/A, 20), DFS
        (5490 - 5710 @ 40), (N/A, 27), DFS
Date: Sun May 27 23:54:44 2012
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 192.168.1.9  metric 2
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: Upgraded to precise on 2012-05-20 (7 days ago)
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         disabled

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


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1005304

Title:
  "domain" and "search" are mutually exclusive in resolv.conf

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