The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: mercurial 4.8.2-1ubuntu3.19.04.1 mercurial-common 4.8.2-1ubuntu3.19.04.1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-4086-1
CVE-2019-3902
https://launchpad.net/ubuntu/+source/mercurial/4.8.2-1ubuntu3.19.04.1
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