Comment 1 for bug 1714446

The same CSS and profile links are embedded in the "home page" and other pages as well, however these don't get a degraded security warning.

I'm pretty sure this is related more to the <form> calls to the insecure http://cdimage.ubuntu.com site. We will have to try and convince Canonical to install an SSL cert on cdimage.ubuntu.com so that we can use https in these form calls (they direct the visitor to the correct iso on cdimage.ubuntu.com)