The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: libfreetype6 2.6.1-0.1ubuntu2.4 After a standard system update you need to restart your session to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4126-1
CVE-2015-9383
https://launchpad.net/ubuntu/+source/freetype/2.6.1-0.1ubuntu2.4
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