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[BenTLor <social@xxxxxxxxxx>]

For me the situation is slightly different but the result is the same:
Connect to WiFi
 - internet connection works
Connect LAN cable (note that wifi is still active and nm sets up eth0 correctly)
 - internet connection breaks, although route -n shows both interfaces and routes.

Expected: when I connect eth0, it is preferred over wifi (either with
metric or disconnecting wifi entirely, I don't care) and thus routing
works as normal.

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https://bugs.launchpad.net/bugs/1450652

Title:
  15.04: no route when connected to both WiFi and Ethernet

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  Steps to reproduce
  ===============

  1) Enable both a WiFi connection and plug into Ethernet
  2) Test your network connectivity or run `route`

  Expected results
  =============

  NetworkManager should prefer the wired connection over the WiFi
  connection, and `route` should return something like this:

  $ route
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  default         10.17.75.1      0.0.0.0         UG    1024   0        0 wlan0
  10.17.75.0      *               255.255.255.0   U     0      0        0 wlan0
  link-local      *               255.255.0.0     U     1000   0        0 wlan0

  (To get the above results on Vivid, I had to unplug my Ethernet.)

  Actual results
  ===========

  `route` will produce no results and your connectivity will be broken

  Work-arounds
  ===========

  As soon as you disable either the WiFi or unplug from Ethernet, you
  will again have a route and your network connectivity will work. This
  is a regression from Trusty and Utopic.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu15.1
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Apr 30 16:00:09 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IpRoute:
   default via 10.17.75.1 dev wlan0  proto static  metric 1024 
   10.17.75.0/24 dev wlan0  proto kernel  scope link  src 10.17.75.247 
   169.254.0.0/16 dev wlan0  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-con:
   NAME                UUID                                  TYPE             TIMESTAMP   TIMESTAMP-REAL                   AUTOCONNECT  READONLY  DBUS-PATH                                   ACTIVE  DEVICE  STATE      ACTIVE-PATH                                        
   Wired connection 1  4ff8582e-2864-4729-877e-52b037de1ee8  802-3-ethernet   1430431120  Thu 30 Apr 2015 03:58:40 PM MDT  yes          no        /org/freedesktop/NetworkManager/Settings/1  no      --      --         --                                                 
   system76_5g         74de1f59-702b-4d15-9803-82b281989bed  802-11-wireless  1430431008  Thu 30 Apr 2015 03:56:48 PM MDT  yes          no        /org/freedesktop/NetworkManager/Settings/0  yes     wlan0   activated  /org/freedesktop/NetworkManager/ActiveConnection/1
  nmcli-dev:
   DEVICE  TYPE      STATE        DBUS-PATH                                  CONNECTION   CON-UUID                              CON-PATH                                           
   wlan0   wifi      connected    /org/freedesktop/NetworkManager/Devices/2  system76_5g  74de1f59-702b-4d15-9803-82b281989bed  /org/freedesktop/NetworkManager/ActiveConnection/1 
   eth0    ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/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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