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[Jo Ried <ried@xxxxxx>]

I have the same problem on two independent systems with Ubuntu 15.04.
32bit and 64bit

The NetworkManager.service dies after switching from WLAN to Wired Lan,
with the following message:

NetworkManager.service - Network Manager
   Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: failed (Result: signal) since Mo 2015-09-21 21:15:19 CEST; 17min ago

Sep 21 21:09:59 NOTEBOOK NetworkManager[658]: <error>
[1442862599.112057] [platform/nm-linux-platform.c:1714] add_object():
Netlink error adding ff11:1111:2222:3333:444:5555:6666:affe/64 lft
3645se...address family

My solution:
restart the service with: systemctl restart NetworkManager

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1461015

Title:
  Wired disconnects due to add_object(): Netlink error adding 0.0.0.0/0

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  I have a Lenovo Thinkpad E540 with r8169 wired onboard networking.
  After 15-30 minutes use the network stops working. There are no
  messages in dmesg, link stays up etc.

  This is output to journal:

  kesä 02 12:59:42 villenthinkpad avahi-daemon[925]: Withdrawing address record for 192.168.125.60 on eth0.
  kesä 02 12:59:42 villenthinkpad avahi-daemon[925]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.125.60.
  kesä 02 12:59:42 villenthinkpad avahi-daemon[925]: Interface eth0.IPv4 no longer relevant for mDNS.
  kesä 02 12:59:42 villenthinkpad NetworkManager[921]: <error> [1433239182.454827] [platform/nm-linux-platform.c:1714] add_object(): Netlink error adding 0.0.0.0/0 via 192.168.125.1 dev eth0 metric 1024 mss 0 src 
  kesä 02 12:59:42 villenthinkpad NetworkManager[921]: inet default table main
  kesä 02 12:59:42 villenthinkpad NetworkManager[921]: priority 0x400 protocol static
  kesä 02 12:59:42 villenthinkpad NetworkManager[921]: nexthop via 192.168.125.1 dev 2

  Disconnecting and reconnecting the cable solves the issue until next
  reboot, so I don't think it's a DHCP configuration issue. Other PC's
  on the network work fine.

  This has also been reported as kernel bug #1459985 as it's still
  unknown what causes the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu15.1
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: X-Cinnamon
  Date: Tue Jun  2 13:09:36 2015
  EcryptfsInUse: Yes
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2015-02-12 (109 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  IpRoute:
   default via 192.168.125.1 dev eth0  proto static  metric 1024 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.125.0/24 dev eth0  proto kernel  scope link  src 192.168.125.60 
   192.168.135.1 dev wlan0  proto static  scope link  metric 1024
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to vivid on 2015-05-12 (20 days ago)
  nmcli-dev:
   DEVICE  TYPE      STATE      DBUS-PATH                                  CONNECTION          CON-UUID                              CON-PATH                                           
   eth0    ethernet  connected  /org/freedesktop/NetworkManager/Devices/1  Wired connection 1  2ef5399f-13a6-4337-9f55-d0d2e44cc43b  /org/freedesktop/NetworkManager/ActiveConnection/2 
   wlan0   wifi      connected  /org/freedesktop/NetworkManager/Devices/2  T2                  a59517ed-1d2b-4c2e-99a5-ee1f3afdc311  /org/freedesktop/NetworkManager/ActiveConnection/1 
   lo      loopback  unmanaged  /org/freedesktop/NetworkManager/Devices/0  --                  --                                    --
  nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

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