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[Mark Jaroski <mark@xxxxxxxxxxxx>]

I'm experiencing exactly the same thing as the other report.

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https://bugs.launchpad.net/bugs/1485558

Title:
  NetworkManager breaks vboxnet* connections since 15.04, worked in
  14.04 and 14.10, nm-applet fills with irrelevant entries.

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  On an Asus laptop running a freshly installed Ubuntu 15.04 64-bit, nm-
  applet shows that NetworkManager wants to manage vboxnet0 and
  vboxnet1. These are created by virtualbox which runs some guest OS
  inside a VM. On previous Ubuntu releases, network-manager did not try
  to manage them and there was no problem.

  # Observed behavior

  * nm-applet shows spinning animation for a long time, while it is not relevant. Clicking on "disconnect" in the menu unconfigures the interface which breaks it.
  * after suspend-resume of the host, vboxnet* lose their correct configurations. vboxnet0 (a host-only interface where virtualbox runs a private dhcp server) gets a different IP address. Looks like https://bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1460750 but does not feel like a bug in virtualbox.

  # Expected behavior

  * Just like in 14.04 and 14.10, these interfaces are just ignored by
  network-manager and they just work.

  # Additional information

  * After reading http://superuser.com/questions/9720/disabling-
  networkmanager-for-a-specific-interface tried to add these lines to
  /etc/network/interfaces. Even after restarting network-manager, it has
  no effect.

  iface vboxnet0 inet manual
  iface vboxnet1 inet manual

  So, reverted the change.

  * Tried from https://blogs.gnome.org/dcbw/2015/02/16/networkmanager-
  for-administrators-part-1/ to add in /etc/NetworkManager/conf.d/ a
  file 50-virtualbox.conf containing the following lines. Even after
  restarting network-manager, it is ignored.

  [keyfile]
  unmanaged-devices=vboxnet0,vboxnet1

  * This is not eactly like https://www.virtualbox.org/ticket/13873, I'm not using Vagrant.
  * Booting to 14.04 or 14.10 (that have been kept intact on the same machine) things just work as expected.
  * /usr/share/doc/network-manager/NEWS.gz states that "'veth' interfaces are now unmanaged by default to cooperate better with external tools". Should vboxnet* be treated the same ?
  * This seems on the topic but unclear to me: https://bugzilla.gnome.org/show_bug.cgi?id=731014

  Thank you for your attention.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu15.1
  ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2
  Uname: Linux 3.19.0-25-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.2
  Architecture: amd64
  Date: Mon Aug 17 13:13:04 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2015-08-15 (1 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  IpRoute:
   default via 192.168.47.1 dev wlan0  proto static  metric 1024 
   169.254.0.0/16 dev vboxnet0  scope link  metric 1000 
   192.168.47.0/24 dev wlan0  proto kernel  scope link  src 192.168.47.6 
   192.168.56.0/24 dev vboxnet0  proto kernel  scope link  src 192.168.56.102
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   LANGUAGE=fr_FR
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  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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