The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS (Available with Ubuntu Pro): libx11-6 2:1.6.4-3ubuntu0.4+esm1 Ubuntu 16.04 LTS (Available with Ubuntu Pro): libx11-6 2:1.6.3-1ubuntu2.2+esm2 Ubuntu 14.04 LTS (Available with Ubuntu Pro): libx11-6 2:1.6.2-1ubuntu2.1+esm3 After a standard system update you need to reboot your computer to make all the necessary changes.
https://ubuntu.com/security/notices/USN-6168-2
https://ubuntu.com/security/notices/USN-6168-1
CVE-2023-3138
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