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[Ben Howard <ben.howard@xxxxxxxxxxxxx>]

Downgrading (i.e. sudo apt-get -y --reinstall install --force-yes
network-manager=1.0.4-0ubuntu5) and then rebooting fixed me.

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https://bugs.launchpad.net/bugs/1521136

Title:
  NetworkManager segfaults on connect

Status in network-manager package in Ubuntu:
  New

Bug description:
  Upon connecting, NetworkManager from -updates is segfaulting:

  [  139.520739] NetworkManager[15884]: segfault at 0 ip
  0000000000497ad7 sp 00007fff77195d00 error 4 in
  NetworkManager[400000+1bf000]

  
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  keyfile: add connection in-memory (c4b6e184-67e3-4a12-8dd3-79ec7ef650e0,"enx803f5d087a34")
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (enx803f5d087a34): device state change: unmanaged -> unavailable (reason 'connection-assumed') [10 20 41]
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (enx803f5d087a34): device state change: unavailable -> disconnected (reason 'connection-assumed') [20 30 41]
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (enx803f5d087a34): Activation: starting connection 'enx803f5d087a34' (c4b6e184-67e3-4a12-8dd3-79ec7ef650e0)
  Nov 30 10:31:23 arbella NetworkManager[16259]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (lo): link connected
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (lo): new Generic device (carrier: ON, driver: 'unknown', ifindex: 1)
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (wlp2s0): using nl80211 for WiFi device control
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (wlp2s0): driver supports Access Point (AP) mode
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (wlp2s0): new 802.11 WiFi device (carrier: UNKNOWN, driver: 'ath10k_pci', ifindex: 3)
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (wlp2s0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
  Nov 30 10:31:23 arbella kernel: [  140.168048] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  urfkill disappeared from the bus
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  use BlueZ version 5
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  wpa_supplicant running
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (wlp2s0): supplicant interface state: starting -> ready
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (lxcbr0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  (enx803f5d087a34): device state change: disconnected -> prepare (reason 'none') [30 40 0]
  Nov 30 10:31:23 arbella NetworkManager[16259]: <info>  Policy set 'enx803f5d087a34' (enx803f5d087a34) as default for IPv4 routing and DNS.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: Network-Manager 1.0.4-0ubuntu5
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Nov 30 10:39:36 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2015-11-21 (9 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  IpRoute:
   default via 10.20.64.1 dev wlp2s0  proto static  metric 600 
   10.0.3.0/24 dev lxcbr0  proto kernel  scope link  src 10.0.3.1 
   10.20.64.0/21 dev wlp2s0  proto kernel  scope link  src 10.20.66.104  metric 600 
   169.254.0.0/16 dev lxcbr0  scope link  metric 1000
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE  TYPE      STATE      DBUS-PATH                                  CONNECTION          CON-UUID                              CON-PATH                                           
   lxcbr0  bridge    connected  /org/freedesktop/NetworkManager/Devices/3  lxcbr0              ac91e68a-905e-4cd2-a937-11b8c5f4bed0  /org/freedesktop/NetworkManager/ActiveConnection/1 
   wlp2s0  wifi      connected  /org/freedesktop/NetworkManager/Devices/2  Canonical-2.4GHz-g  4eb6b0d8-a49e-4e11-aff1-18ce3f158523  /org/freedesktop/NetworkManager/ActiveConnection/2 
   lo      loopback  unmanaged  /org/freedesktop/NetworkManager/Devices/1  --                  --                                    --
  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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