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[wantlamy <wantlamy@xxxxxxxxx>]

pptp vpn works on ubuntu 14.04 with kernel 3.13.x and 3.16.x, but doesn't work with kernel 3.19.x.
And it doesn't work by default, until insmod nf_conntrack_pptp.

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https://bugs.launchpad.net/bugs/1452941

Title:
  PPTP VPN fails to connect in 15.04, but works in 14.04/14.10

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  I can create a PPTP VPN connection and connect to a remote network in
  Ubuntu 14.04/14.10 (Unity live boot DVD) but the connection does not
  work in Ubuntu 15.04 (Unity live boot USB), even though I am using the
  exact same GUI configuration settings in the Network-Manager (I have
  confirmed this several times).  In addition to the live boot
  instances, the PPTP VPN connected without problems for me on my
  14.04/14.10 installs, but failed on a fresh harddisk install of Ubuntu
  MATE 15.04.

  The error that I get in a notification pop-up window when trying to
  connect on 15.04 is: "The VPN connection 'VPN connection 1' failed
  because the VPN service returned invalid configuration."

  ubuntu@ubuntu:~$ lsb_release -rd
  Description:	Ubuntu 15.04
  Release:	15.04

  ubuntu@ubuntu:~$ apt-cache policy network-manager
  network-manager:
    Installed: 0.9.10.0-4ubuntu15
    Candidate: 0.9.10.0-4ubuntu15
    Version table:
   *** 0.9.10.0-4ubuntu15 0
          500 http://archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu15
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CasperVersion: 1.360
  CurrentDesktop: Unity
  Date: Thu May  7 22:55:12 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IpRoute:
   default via 192.168.0.1 dev wlan0  proto static  metric 1024 
   169.254.0.0/16 dev wlan0  scope link  metric 1000 
   192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.20 
   207.173.246.134 via 192.168.0.1 dev wlan0  src 192.168.0.20
  LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE  TYPE      STATE        DBUS-PATH                                  CONNECTION     CON-UUID                              CON-PATH                                           
   wlan0   wifi      connected    /org/freedesktop/NetworkManager/Devices/2  LANbeforetime  1fefef93-2d1c-41eb-ad55-3f6c234d7023  /org/freedesktop/NetworkManager/ActiveConnection/0 
   eth0    ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/1  --             --                                    --                                                 
   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'.

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