Droplet console (Ubuntu 18.04.3) error: 'PKCS#7 signature not signed with a trusted key'

PKCS#7 signature not signed with a trusted key

DigitialOcean- can you eliminate this error msg/symptom?

I’m seeing this (seemingly) error message on my Droplet consoles - screenshot of 1 console below. I have not surveyed all the Droplets to see if they exhibit this msg. The 2 droplets I did survey (by running their console) did both exhibit this error, and both are running Ubuntu 18.04.3 (coincidentally or not).

Weblink #1 below shows a screenshot of one of these consoles. The rest of the weblinks show results of brief web searching I did hunting for accounts of similar experiences. I’m not trying to “solve” this; rather, I’m just giving DO a jumpstart on the search.

1. https://i.imgur.com/ogXXllp.png
2. https://www.google.com/search?q=pkcs%237+signature+not+signed+with+a+trusted+key
3. https://unix.stackexchange.com/questions/455189/pkcs7-signature-not-signed-with-a-trusted-key
4. https://askubuntu.com/questions/1031375/pkcs-signature-error-warnings-running-dmesg-on-ubuntu-mate-18-04
5. https://www.linuxquestions.org/questions/linux-hardware-18/ubuntu-18-04-lts-desktop-pkcs-7-signature-not-signed-with-a-trusted-key-nvidia-gpu-4175646607/

Thanks for any help, ~J