The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: libx11-6 2:1.6.3-1ubuntu2.2+esm1 Ubuntu 14.04 ESM: libx11-6 2:1.6.2-1ubuntu2.1+esm2 After a standard system update you need to reboot your computer to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4966-2
https://ubuntu.com/security/notices/USN-4966-1
CVE-2021-31535
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