Public bug reported:

My network cable is plugged in but NM shows it is trying to connect to WiFi.
This happened on Ubuntu 15.04 and continues after upgrade to 15.10.
I have a RTL8723be card and it is hardly working correctly, but that is a whole 
other issue. 

1) Ubuntu 15.10, 64bit

2) network-manager:
  Installed: 1.0.4-0ubuntu5.1
  Candidate: 1.0.4-0ubuntu5.1
  Version table:
 *** 1.0.4-0ubuntu5.1 0
        500 http://mirrors.neterra.net/ubuntu/ wily-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.0.4-0ubuntu5 0
        500 http://mirrors.neterra.net/ubuntu/ wily/main amd64 Packages

3, 4) Expected is that when network cable is plugged in and obviously I
have a stable, well running connection, NM should not try to also
connect via WiFi. Also expected that when I pull out the cable, the WiFi
would connect. Instead the wifi shows connected but there is no internet
activity.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: network-manager 1.0.4-0ubuntu5.1
Uname: Linux 4.3.0-040300-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Nov 17 15:58:42 2015
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2014-12-07 (344 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
IpRoute:
 default via 192.168.0.1 dev eth0  proto static  metric 100 
 default via 192.168.0.1 dev wlan0  proto static  metric 600 
 169.254.0.0/16 dev eth0  scope link  metric 1000 
 192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.101  metric 
100 
 192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.104  metric 
600
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to wily on 2015-10-23 (24 days ago)
nmcli-dev:
 DEVICE  TYPE      STATE      DBUS-PATH                                  
CONNECTION          CON-UUID                              CON-PATH              
                             
 eth0    ethernet  connected  /org/freedesktop/NetworkManager/Devices/2  Wired 
connection 1  e0a0e162-076e-43d9-8699-472157a8989d  
/org/freedesktop/NetworkManager/ActiveConnection/6 
 wlan0   wifi      connected  /org/freedesktop/NetworkManager/Devices/1  Tundra 
1            c035b039-27ae-46de-b025-57437bf6b07f  
/org/freedesktop/NetworkManager/ActiveConnection/7 
 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'.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug wily

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https://bugs.launchpad.net/bugs/1517059

Title:
  Ubuntu keeps trying to connect to a WiFi network while plugged into an
  ethernet

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