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[Claudio Alejandro Sanhueza Lobos <csanhuezalobos@xxxxxxxxx>]

Fixed after following this:

http://askubuntu.com/questions/727127/last-upgrade-crashes-network-
manager-no-internet-connection-no-applet

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https://bugs.launchpad.net/bugs/1539634

Title:
  network-manager crashes when using libnl-3-200-3.21.1-1ubuntu1

Status in network-manager package in Ubuntu:
  Fix Released
Status in network-manager source package in Trusty:
  Fix Committed

Bug description:
  [Triage Notes]

  This regression is caused by a libnl proposed update tracked in bug
  1511735. It has not been released as an update, only proposed as an
  update for early testing. If you volunteered to test proposed updates,
  then thank you. Your care and attention will stop this regression from
  hitting ordinary users, and we appreciate your contribution to Ubuntu.

  If you are not aware that you volunteered to test proposed updates,
  then please be aware that your system is configured to do so. In this
  case, you probably should turn this off. I'd appreciate if someone
  could explain how to do this in the comments.

  [Impact]

   * NetworkManager depends on libnl (libnl-3-200 libnl-genl-3-200
     libnl-route-3-200) and when libnl is updated to proposed
     3.2.21-1ubuntu1 NM segfaults due to libnl exposing a bug in NM
     validation packets.

     This affects the 0.98 release of NetworkManager and has already
     been fixed in newer releases.

   * Backporting fixes from upstream release is required to prevent
     NetworkManager from faulting which breaks networking on most
     Desktop releases.

   * All patches applied are already accepted upstream and newer Ubuntu
     releases are not affected.

   * Upgrading NetworkManager to 0.9.8.8-0ubuntu7.3 prior to updating
     libnl-3.2.21-1ubuntu1 is required to prevent NetworkManager crashing.

  [Test Case]

   * Reproduce crash test:
      1. Download 14.04.03 Desktop iso, amd64
      2. Launched in a VM, run from iso
      3. In terminal, enable proposed
      4. sudo apt-get install libnl-3-200 libnl-genl-3-200 libnl-route-3-200
      5. sudo restart network-manager
      #  note the nm-applet disappears as NM has now crashed, no network
         conn.
      6. dmesg to confirm network-manager crash
      7. sudo dpkg --install gir1.2-networkmanager-1.0_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib4_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib-vpn1_0.9.8.8-0ubuntu7.3_amd64.deb libnm-util2_0.9.8.8-0ubuntu7.3_amd64.deb network-manager_0.9.8.8-0ubuntu7.3_amd64.deb
      8. sudo start network-manager
      #  nm-applet reappears, network connectivity restored

   * Successful upgrade test:
     1. Download 14.04.03 Desktop iso, amd64
     2. Launched in a VM, run from iso
     3. In a terminal, sudo dpkg --install gir1.2-networkmanager-1.0_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib4_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib-vpn1_0.9.8.8-0ubuntu7.3_amd64.deb libnm-util2_0.9.8.8-0ubuntu7.3_amd64.deb network-manager_0.9.8.8-0ubuntu7.3_amd64.deb
     4. sudo restart network-manager  # NM still runs, no crash, net up
     5. enable trusty-proposed in /etc/apt/sources.list
     6. sudo apt-get update
     7. sudo apt-get install libnl-3-200 libnl-genl-3-200 libnl-route-3-200
     8. sudo restart network-manager  # NM still runs, no crash, net up.

  [Regression Potential]

   * NetworkManager is a highly visible package, so testing NetworkManager
     functionality is critical.  The patch does address the crash specificly
     introduced by the updated libnl SRU.

   * We need to ensure that users have installed this NetworkManager
     update before installing libnl3 update (special phasing needed).

  [Original Description]
  Testing out proposed libnl-3 package[1] exposed a bug in NM 0.98.

  After installing updated libnl3 and restarting networkmanager, NM
  crashes with:

  /var/log/syslog shows:
  init: network-manager main process (1057) killed by SEGV signal
  init: network-manager main process ended, respawning
  init: network-manager main process (1065) killed by SEGV signal
  init: network-manager respawning too fast, stopped

  The bug has been fixed in upstream 0.98 with these patches:

  http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=8e4576b9fdb5c888d20a13aa2cc198df790dba54
  http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=65981edb9f562c07e78815c98093da67c50bfdcf

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