Login via Firefox, problems with root CA

General
1

OS - Linux Mint 21.3 Cinnamon on an old MacBook, Server One

The StartOS Dashboard comes up, but it never connects. Typically, I’d screenshot some of this for you, but I can’t figure out how to screenshot with Mint loaded on a MacBook, which doesn’t have a ‘prntscrn’ button.

Regarding not connecting to Server One in Firefox:
I see in the address bar to the right of the [adjective]-[noun].local, the little lock has a triangle with an ‘!’.
When I click on the lock it and follow the arrows, it shows me the Root CA.
In the ‘Certificate for …’ I find this:

Basic Constraints

Certificate Authority Yes

Key Usages

Purposes Digital Signature, Certificate Signing, CRL Signing

I’m guessing that this is the problem, but I don’t understand what it is saying nor how to proceed and fix the problem.

p.s. If you can tell me how to do a screenshot with Mint loaded on an old MacBook, I’d appreciate that very much.

2

You may have missed the device setup. Start here:

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Thanks Rexter. Sorry so late to respond. I had to set this issue aside and will get back on it later, life gets in the way. Thanks for being there.

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We’re here when you need us. Once you’ve gone through the device setup a few times, it only take a few minutes. It can be a little intimidating at first.