The problem can be corrected by updating your system to the following package versions: Ubuntu 19.10: thunderbird 1:68.2.2+build1-0ubuntu0.19.10.1 Ubuntu 18.04 LTS: thunderbird 1:68.2.2+build1-0ubuntu0.18.04.1 After a standard system update you need to restart Thunderbird to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4202-1
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1854150
https://launchpad.net/ubuntu/+source/thunderbird/1:68.2.2+build1-0ubuntu0.19.10.1 https://launchpad.net/ubuntu/+source/thunderbird/1:68.2.2+build1-0ubuntu0.18.04.1
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