The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: libdjvulibre21 3.5.27.1-5ubuntu0.1+esm1 After a standard system update you need to reboot your computer to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4957-2
https://ubuntu.com/security/notices/USN-4957-1
CVE-2021-32490, CVE-2021-32491, CVE-2021-32492, CVE-2021-32493,
CVE-2021-3500
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