/etc/apport/native-origins.d/thunderbird is in thunderbird 1:24.4.0+build1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | LP-PPA-ubuntu-mozilla-daily
LP-PPA-ubuntu-mozilla-daily-thunderbird-aurora
LP-PPA-mozillateam-thunderbird-next
|