I don't have the graphical 'has closed unexpectedly' popups in my environment, but I ran gdb, loaded /usr/bin/nm-connection-editor, and reproduced the crash again. The output is the similar to the original poster of this issue:
warning: Error reading shared library list entry at 0x6f20 [New Thread 0xb21bdb40 (LWP 4975)] [New Thread 0xb19bcb40 (LWP 4976)] [New Thread 0xb11bbb40 (LWP 4977)] [New Thread 0xb09bab40 (LWP 4978)] [New Thread 0xb01b9b40 (LWP 4979)] warning: Error reading shared library list entry at 0xffffe4c0 warning: Error reading shared library list entry at 0xffffe7e0 [New Thread 0xaf989b40 (LWP 4980)] [New Thread 0xaf188b40 (LWP 4981)] Thread 1 "nm-connection-e" received signal SIGSEGV, Segmentation fault. 0xb7f8ab74 in modules_initialized (object=0x0, res=0xbdf6c8, user_data=0xbe31b8) at src/libnma/nma-cert-chooser-button.c:98 98 src/libnma/nma-cert-chooser-button.c: No such file or directory. (gdb) I did some searching and the issue is already captured in this Debian mailing list: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=883965. The most recent post (8 Apr 2018) pushes "network-manager-applet (1.8.10-3) unstable; urgency=medium" which "Fixes a segfault when editing an existing connection". Ubuntu 18.04 bionic currently has an older network-manager-applet, 1.8.10-2ubuntu2. Can we please update to 1.8.10-3 in order to fix this issue? ** Bug watch added: Debian Bug tracker #883965 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=883965 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager-applet in Ubuntu. https://bugs.launchpad.net/bugs/1806269 Title: nm-connection-editor crashes when trying to modify connection Status in network-manager-applet package in Ubuntu: Confirmed Bug description: Thread 1 "nm-connection-e" received signal SIGSEGV, Segmentation fault. 0x00007ffff7ba6b53 in modules_initialized (object=<optimised out>, res=0x555556048a40, user_data=<optimised out>) at src/libnma/nma-cert-chooser-button.c:98 98 src/libnma/nma-cert-chooser-button.c: No such file or directory. This occurs when the package "gnome-keyring" is not installed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1806269/+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