I've just partially solved the mystery. The certificate is invalid when navigating through HTTPS.
Is it just that the browser defaults to HTTPS while other browsers don't? And, maybe my desktop has an older/newer version which doesn't default to HTTPS? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1499433 Title: Site security certificate is not trusted. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1499433/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs