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[Stéphane Berthelot <sberthelot@xxxxxxxxxx>]

I also encounter this bug on fresh Kubuntu 15.04 install. I'm on SSD I don't know if the daemons starting speed has somthing to do with this.
I suppose NM gets the DNS info (from DHCP), tries to notify dnsmasq. Since dnsmasq is not yet started it launches it but I don't see any retry afterwards to send DNS info to dnsmasq once started.
The symptoms for me are working IP stacks (both 4 and 6), correct routing, but with all DNS requests "refused" (by 127.0.1.1).
Restarting NM after makes everything work as expected (dnsmasq is then already started)
How can I see if NM retries to pass the DNS info to dnsmasq once started ?

That's what I get on boot, nothing about NM or dnsmasq after, until I
restart NM service.

juil. 22 09:27:17 architect NetworkManager[973]: <info> NetworkManager state is now CONNECTED_LOCAL
juil. 22 09:27:17 architect NetworkManager[973]: <info> NetworkManager state is now CONNECTED_GLOBAL
juil. 22 09:27:17 architect NetworkManager[973]: <info> Policy set 'Connexion filaire 1' (eth0) as default for IPv6 routing and DNS.
juil. 22 09:27:17 architect NetworkManager[973]: <info> DNS: starting dnsmasq...
juil. 22 09:27:17 architect NetworkManager[973]: <warn> dnsmasq not available on the bus, can't update servers.
juil. 22 09:27:17 architect NetworkManager[973]: <error> [1437550037.972824] [dns-manager/nm-dns-dnsmasq.c:398] update(): dnsmasq owner 
juil. 22 09:27:17 architect NetworkManager[973]: <warn> DNS: plugin dnsmasq update failed
juil. 22 09:27:17 architect NetworkManager[973]: <info> Writing DNS information to /sbin/resolvconf
juil. 22 09:27:17 architect whoopsie[946]: [09:27:17] Cannot reach: https://daisy.ubuntu.com
juil. 22 09:27:17 architect dnsmasq[1150]: démarrage avec le cache désactivé (version 2.72)
juil. 22 09:27:17 architect dnsmasq[1150]: options à la compilation : IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ip
juil. 22 09:27:17 architect dnsmasq[1150]: Support DBus autorisé : connecté au bus système
juil. 22 09:27:17 architect dnsmasq[1150]: attention : aucun serveur amont n'est configuré
juil. 22 09:27:18 architect kernel: random: nonblocking pool is initialized
juil. 22 09:27:18 architect org.kde.kded5[1135]: Saving

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Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1048430

Title:
  "dnsmasq not available on the bus"

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  Dnsmasq seems to be having some issues. This occurs whenever I try to
  connect to my wireless network; sometimes it only happens once, but
  sometimes the error loops for a while.

  Sep  9 17:43:51 bkerensa NetworkManager[935]: <info> DNS: starting dnsmasq...
  Sep  9 17:43:51 bkerensa NetworkManager[935]: <error> [1347237831.899067] [nm-dns-dnsmasq.c:390] update(): dnsmasq not available on the bus, can't update servers.
  Sep  9 17:43:51 bkerensa NetworkManager[935]: <error> [1347237831.899142] [nm-dns-dnsmasq.c:392] update(): dnsmasq owner not found on bus: Could not get owner of name 'org.freedesktop.NetworkManager.dnsmasq': no such name
  Sep  9 17:43:51 bkerensa NetworkManager[935]: <warn> DNS: plugin dnsmasq update failed
  Sep  9 17:43:51 bkerensa NetworkManager[935]: <info> ((null)): writing resolv.conf to /sbin/resolvconf

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: dnsmasq (not installed)
  ProcVersionSignature: Ubuntu 3.5.0-13.14-generic 3.5.3
  Uname: Linux 3.5.0-13-generic x86_64
  ApportVersion: 2.5.1-0ubuntu7
  Architecture: amd64
  Date: Sun Sep  9 17:47:22 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: dnsmasq
  UpgradeStatus: Upgraded to quantal on 2012-08-08 (32 days ago)

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