The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: jbig2dec 0.12+20150918-1ubuntu0.1+esm2 libjbig2dec0 0.12+20150918-1ubuntu0.1+esm2 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5405-1
CVE-2017-9216, CVE-2020-12268
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