NetworkManager doesn't configure wired network connection properly

[Jan Rathmann]

Hello,

after installing Vivid, nearly each time when I boot my PC NetworkManager fails to setup the (wired) connection to my router (via DHCP) properly. That means:

- I can ping only the IP of my router.
- If I try to ping e.g. ubuntu.com, this results either in "Unknown host" or "Network is down" error.
- If I disconnect and connect again via the network-manager-applet, the connection is usually fine, so this is a workaround for me to get internet access.

This didn't happen in any previous Ubuntu version.

My home network setup is very plain, only a router that establishes the internet connection and assigns IP adresses via DHCP to all connected clients. The PC with Vivid running is connected via a wired link.

The informations of the report were collected when the network connection was in faulty state (as mentioned above) in hope that it may give any hint to what's going wrong.

Kind regards,
Jan

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.10.0-4ubuntu15
ProcVersionSignature: Ubuntu 3.19.0-14.14-generic 3.19.3
Uname: Linux 3.19.0-14-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Apr 19 21:48:18 2015
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2015-04-16 (3 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150415)
IpRoute: 192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.103
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
RfKill:

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
 Kabelnetzwerkverbindung 1 1654fa28-838d-4b95-821f-c6e0e8a6451d 802-3-ethernet 1429472871 So 19 Apr 2015 21:47:51 CEST yes no /org/freedesktop/NetworkManager/Settings/0 yes eth0 activated /org/freedesktop/NetworkManager/ActiveConnection/0
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 eth0 ethernet connected /org/freedesktop/NetworkManager/Devices/1 Kabelnetzwerkverbindung 1 1654fa28-838d-4b95-821f-c6e0e8a6451d /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'.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.