In Ubuntu 17.04 or newer, there is a script at /etc/update-motd.d/50-motd-news that reads motd.ubuntu.com and displays that text with the rest of the MOTD.
Currently, motd.ubuntu.com shows a news item about HBO's Silicon Valley which has a reference to Ubuntu.
https://bugs.launchpad.net/ubuntu/ source/base-files/ bug/1701068
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