I have the same version of TB and Ubuntu and had segfaults similarly upon downloading IMAP headers with the option "Make the messages in my Inbox available when I am working offline" checked. This was caused by being out of disk space, and I could reproduce this error.
-- Thunderbird crashes with "Segmentation Fault", debug log shows "failed creating protocol instance to play queued url", trying to download headers from Dovecot IMAP server https://bugs.launchpad.net/bugs/276831 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
