Public bug reported:

DHCP Network connection

eth0 card drops connection and is not av. anymore.

you have to choose disconnect and reconnect manually

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: network-manager 1.0.4-0ubuntu5.3
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
Date: Tue Apr  5 14:50:28 2016
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-01-07 (88 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
IpRoute:
 default via 192.168.0.1 dev enp2s0  proto static  metric 100 
 169.254.0.0/16 dev enp2s0  scope link  metric 1000 
 192.168.0.0/24 dev enp2s0  proto kernel  scope link  src 192.168.0.31  metric 
100
IwConfig:
 enp2s0    no wireless extensions.
 
 lo        no wireless extensions.
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
RfKill:
 
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con:
 NAME                       UUID                                  TYPE          
  TIMESTAMP   TIMESTAMP-REAL                AUTOCONNECT  AUTOCONNECT-PRIORITY  
READONLY  DBUS-PATH                                   ACTIVE  DEVICE  STATE     
 ACTIVE-PATH                                        
 Kabelnetzwerkverbindung 1  3c8dcb3c-23b7-4a64-a4aa-9dc20504a0e6  
802-3-ethernet  1459860635  Di 05 Apr 2016 14:50:35 CEST  yes          0        
             no        /org/freedesktop/NetworkManager/Settings/0  yes     
enp2s0  activated  /org/freedesktop/NetworkManager/ActiveConnection/0
nmcli-dev:
 DEVICE  TYPE      STATE      DBUS-PATH                                  
CONNECTION                 CON-UUID                              CON-PATH       
                                    
 enp2s0  ethernet  connected  /org/freedesktop/NetworkManager/Devices/1  
Kabelnetzwerkverbindung 1  3c8dcb3c-23b7-4a64-a4aa-9dc20504a0e6  
/org/freedesktop/NetworkManager/ActiveConnection/0 
 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/1566297

Title:
  Network connections drop for no reason and have to restart manually to
  work again

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