I’ve never encountered any warnings from a Mint update. I don’t know what that could be about. The only warnings of any type I’ve seen is using the Software Manager and getting some warnings about certain packages that have not been fully tested on Mint....but nothing about Mint updates. Sorry.
Thanks for the feedback.
I get the authentication message on another install I did directly from a new .iso cd image I downloaded right off the site again this weekend - so it’s probably not malware.
I’m guessing it has to do with their branding on the Firefox browser, or something related to the custom look in mint.
Much appreciated, thanks.