[Bug 1000244] Re: resolv.conf not populated because /etc/resolv.conf symlink was not created

[Thomas Hood]

It would be helpful if the administrator's own answer to resolvconf
/linkify-resolvconf were recorded somewhere before the value of the
latter gets reset to false in the postinst.

Better yet, perhaps: Change the postinst so that it doesn't fiddle with
the answer to linkify-resolvconf; instead create a new question,
resolvconf/linkify-done, which gets sets from false to true on
linkification and whose value being true prevents linkification being
repeated on subsequent postinst runs.

Even better would be to return to having an idempotent postinst; but
then another solution would have to be found for the problem that the
debconf-fiddling solved.

Regarding #1000244 itself, we still have the unsolved mystery of how pdf
could clean-install 12.04 and end up with no resolv.conf symlink (see
comment #10).

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https://bugs.launchpad.net/bugs/1000244

Title:
  resolv.conf not populated because /etc/resolv.conf symlink was not
  created

Status in “resolvconf” package in Ubuntu:
  Incomplete

Bug description:
  I upgraded an 11.10 install to 12.04, and now I'm unable to resolve
  domain names because Network Manager does not populate my
  /etc/resolv.conf file.

  For example, my local wireless router uses the domain "mylocaldomain"
  and nameservers 10.157.10.12 and 10.157.10.14, so in 11.10, after
  connecting to the router I would see this in my /etc/resolv.conf:

  domain mylocaldomain
  search mylocaldomain
  nameserver 10.157.10.12
  nameserver 10.157.10.14

  Now /etc/resolv.conf contains the settings last set before I upgraded
  to 12.04, and doesn't update them for whatever network I'm currently
  on. I have to manually guess the settings and modify /etc/resolv.conf
  in order to resolve domain names.

  I believe this may be related to
  https://bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/922677 and
  how the "resolvconf" program has been introduce to manage this. I
  believe this is a new bug with how prior installs are improperly
  upgraded.

  I tried removing the line "dns=dnsmasq" from
  /etc/NetworkManager/NetworkManager.conf and then running `sudo restart
  network-manager`, but that had no effect.

  I tried running `resolvconf --enable-updates` but I get the error
  "resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing
  anything."

  Based on https://help.ubuntu.com/12.04/serverguide/network-
  configuration.html#name-resolution, I tried establishing this symlink
  myself, but the file /run/resolvconf/resolv.conf does not exist on my
  system.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: network-manager 0.9.4.0-0ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Wed May 16 09:57:25 2012
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64+mac (20111012)
  IpRoute:
   default via 192.168.1.1 dev eth2  proto static 
   169.254.0.0/16 dev eth2  scope link  metric 1000 
   192.168.1.0/24 dev eth2  proto kernel  scope link  src 192.168.1.205  metric 2 
   192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to precise on 2012-05-10 (5 days ago)
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                                  
   eth2       802-11-wireless   connected     /org/freedesktop/NetworkManager/Devices/1  
   eth0       802-3-ethernet    unavailable   /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

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