apport information

** Attachment added: "CurrentDmesg.txt"
   
https://bugs.launchpad.net/bugs/1754759/+attachment/5078540/+files/CurrentDmesg.txt

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https://bugs.launchpad.net/bugs/1754759

Title:
  LAN connection keeps connecting and disconnecting in an infinite loop

Status in linux package in Ubuntu:
  Confirmed
Status in network-manager package in Ubuntu:
  New

Bug description:
  With Xubuntu 17.10 the following problem occurs on a Lenovo X230 Laptop:
  - Boot from live-ISO
  - Click on network icon in title bar and edit LAN-connection
  - Change MTU from Auto to 1492
  - Connect LAN cable
  => LAN network keeps connecting and disconnecting in an infinite loop

  (No wireless network is configured.)

  The error did not occur on Xubuntu 16.04. The same situation occurs
  with Xubuntu installed on the SSD. I took the ISO for this bug report,
  in order to exclude wrong settings on the installed system.

  This is my first bug report - I hope I did not do too much wrong. If
  necessary, I can provide more information.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: network-manager 1.8.4-1ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
  Uname: Linux 4.13.0-21-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CasperVersion: 1.387
  CurrentDesktop: XFCE
  Date: Fri Mar  9 20:26:21 2018
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IpRoute:
   default via 10.110.120.1 dev enp0s25 proto static metric 100 
   10.110.120.0/24 dev enp0s25 proto kernel scope link src 10.110.120.57 metric 
100 
   169.254.0.0/16 dev enp0s25 scope link metric 1000
  LiveMediaBuild: Xubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  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                                          SLAVE 
   Wired connection 1  db135360-f229-3472-bd3a-eb8d6bc8b601  802-3-ethernet  
1520627169  Fr 09 Mär 2018 20:26:09 UTC  yes          4294966297            no  
      /org/freedesktop/NetworkManager/Settings/1  yes     enp0s25  activated  
/org/freedesktop/NetworkManager/ActiveConnection/32  --
  nmcli-dev:
   DEVICE   TYPE      STATE         DBUS-PATH                                  
CONNECTION          CON-UUID                              CON-PATH              
                              
   enp0s25  ethernet  connected     /org/freedesktop/NetworkManager/Devices/2  
Wired connection 1  db135360-f229-3472-bd3a-eb8d6bc8b601  
/org/freedesktop/NetworkManager/ActiveConnection/32 
   wlp3s0   wifi      disconnected  /org/freedesktop/NetworkManager/Devices/3  
--                  --                                    --                    
                              
   lo       loopback  unmanaged     /org/freedesktop/NetworkManager/Devices/1  
--                  --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  
WIFI     WWAN-HW  WWAN    
   running  1.8.4    connected  started  full          enabled     enabled  
enabled  enabled  enabled
  --- 
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  xubuntu    3822 F.... pulseaudio
  CasperVersion: 1.387
  DistroRelease: Ubuntu 17.10
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IpRoute:
   default via 10.110.120.1 dev enp0s25 proto static metric 100 
   10.110.120.0/24 dev enp0s25 proto kernel scope link src 10.110.120.57 metric 
100 
   169.254.0.0/16 dev enp0s25 scope link metric 1000
  LiveMediaBuild: Xubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105)
  MachineType: LENOVO 2333B15
  Package: network-manager 1.8.4-1ubuntu3
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper 
initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
  ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-21-generic N/A
   linux-backports-modules-4.13.0-21-generic  N/A
   linux-firmware                             1.169.1
  Tags:  artful
  Uname: Linux 4.13.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 04/19/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ETA8WW (2.68 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2333B15
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: R9YFLET
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG2ETA8WW(2.68):bd04/19/2017:svnLENOVO:pn2333B15:pvrThinkPadX230:rvnLENOVO:rn2333B15:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.family: ThinkPad X230
  dmi.product.name: 2333B15
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO
  nmcli-con:
   NAME                UUID                                  TYPE            
TIMESTAMP   TIMESTAMP-REAL               AUTOCONNECT  AUTOCONNECT-PRIORITY  
READONLY  DBUS-PATH                                   ACTIVE  DEVICE   STATE    
  ACTIVE-PATH                                         SLAVE 
   Wired connection 1  fbb05466-4739-330d-ba0a-109a6e5b3cfe  802-3-ethernet  
1520971267  Di 13 Mär 2018 20:01:07 UTC  yes          4294966297            no  
      /org/freedesktop/NetworkManager/Settings/1  yes     enp0s25  activated  
/org/freedesktop/NetworkManager/ActiveConnection/5  --
  nmcli-dev:
   DEVICE   TYPE      STATE         DBUS-PATH                                  
CONNECTION          CON-UUID                              CON-PATH              
                             
   enp0s25  ethernet  connected     /org/freedesktop/NetworkManager/Devices/2  
Wired connection 1  fbb05466-4739-330d-ba0a-109a6e5b3cfe  
/org/freedesktop/NetworkManager/ActiveConnection/5 
   wlp3s0   wifi      disconnected  /org/freedesktop/NetworkManager/Devices/3  
--                  --                                    --                    
                             
   lo       loopback  unmanaged     /org/freedesktop/NetworkManager/Devices/1  
--                  --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  
WIFI     WWAN-HW  WWAN    
   running  1.8.4    connected  started  full          enabled     enabled  
enabled  enabled  enabled

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