Upstream fixed it now in https://gitlab.freedesktop.org/NetworkManager/NetworkManager/commit/5923a30c
** Changed in: network-manager (Ubuntu) Status: Triaged => Fix Committed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1815742 Title: latest network-manager segfaults in disco Status in network-manager package in Ubuntu: Fix Committed Bug description: When I updated to the latest version of networkmanager in disco dingo (1.15.2-0ubuntu1), it started segfaulting. Reverting to the version in cosmic (1.12.4-1ubuntu1.2) solved the problem. Syslog shows the following (will attach a more complete log): feb 13 10:39:45 regan NetworkManager[2315]: NetworkManager:ERROR:src/settings/nm-settings-plugin.c:147:_nm_settings_plugin_emit_signal_connection_added: assertion failed: ((((__extension__ ({ GTypeInstance *__inst = (GTypeInstance*) ((sett_conn)); GType __t = ((nm_settings_connection_get_type ())); gboolean __r; if (!__inst) __r = (0); else if (__inst->g_class && __inst->g_class->g_type == __t) __r = (!(0)); else __r = g_type_check_instance_is_a (__inst, __t); __r; }))))) feb 13 10:39:45 regan NetworkManager[2315]: <info> [1550050785.3612] ifupdown: management mode: managed feb 13 10:39:45 regan NetworkManager[2315]: invalid uninstantiatable type '(null)' in cast to 'NMSettingsConnection' feb 13 10:39:45 regan systemd[1]: NetworkManager.service: Main process exited, code=dumped, status=6/ABRT --- ProblemType: Bug ApportVersion: 2.20.10-0ubuntu20 Architecture: amd64 CurrentDesktop: GNOME DistroRelease: Ubuntu 19.04 InstallationDate: Installed on 2016-12-22 (782 days ago) InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2) NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true Package: network-manager 1.12.4-1ubuntu1.2 PackageArchitecture: amd64 Tags: disco Uname: Linux 4.19.0-1-amd64 x86_64 UpgradeStatus: Upgraded to disco on 2017-09-18 (512 days ago) UserGroups: adm cdrom dialout dip docker libvirt lp lpadmin lxd plugdev sambashare scanner src sudo tss wireshark _MarkForUpload: True mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2018-06-01T16:38:44.962715 nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.12.4 connected started full enabled enabled enabled enabled enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1815742/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp