The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: gnupg 2.2.4-1ubuntu1.5 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5431-1
CVE-2019-13050
https://launchpad.net/ubuntu/+source/gnupg2/2.2.4-1ubuntu1.5
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