The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.27 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5174-2
https://ubuntu.com/security/notices/USN-5174-1
https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1950363
https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.27
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