The latest bug signature I sent to Thunderbird is :bp-62852775-4d7c-48f2-aceb-ed8a00190218 The report shows modules libdbusmenu-glib.so.4.0.12, libgobject-2.0.so.0.5600.3, and libglib-2.0.so.0.5600.3 in red. These modules are in /usr/lib/x86_64-linux-gnu. The crash is systematic on a PC with Ubuntu 18.04 LTS and Thunderbird 60.4.0 (64 bit) + Enigmail version 2.0.9 (20181209-1409) with the latest kernel (4.15.0-45-generic). However, another PC with the same configuration (Ubuntu 18.04 LTS and Thunderbird 60.4.0 (64 bit) + Enigmail version 2.0.9 (20181209-1409) works fine. The difference I have identified is that this PC has not been updated for a few weeks and is still using kernel 4.15.0-38-generic). Also, on this PC, the above modules are libdbusmenu-glib.so.4.0.12, libgobject-2.0.so.0.5600.2, and libglib-2.0.so.0.5600.2. These last 2 modules are therefore one generation older... Does that give any clue towards a solution?