I realized my sources.list file was not standard so I reconstructed my environment with bionic-backports disabled and added bionic-security.
I downloaded the dbgsym '.ddeb' files and installed them in this environment. I had to install the package "libnm-gtk0" using apt-get, because it was not present. The version numbers of the deb files in your link match my system otherwise. I reproduced the crash. The new apport crash log doesn't seem to have any additional backtrace information gleaned from the symbol information. I have still attached the file to this comment. ** Attachment added: "_usr_bin_nm-connection-editor.999.crash" https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1806269/+attachment/5296986/+files/_usr_bin_nm-connection-editor.999.crash -- 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
