Also just happened to me on a machine with "proposed" disabled. I fixed by downloading a newer version of network-manager via another computer/usb stick. My system seemed to show a newer version was available, and had I done the upgrade before turning it off it probably would have skipped this issue.
http://packages.ubuntu.com/trusty-updates/network-manager I also grabbed libnm-glib4_0.9.8.8-0ubuntu7.3_amd64.deb and libnm- util2_0.9.8.8-0ubuntu7.3_amd64.deb as I wasn't sure if they were needed to fix the problem or required by network manager. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1539634 Title: network-manager crashes when using libnl-3-200-3.21.1-1ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1539634/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs