You're right for pages with links to login pages. Fortunately in this case, ubuntu does not appear to link to login.launchpad.net anywhere on their main website as far as I can tell. I'm sure it's linked somewhere but I was only able to find it via a search. Odd.

In any case I understand the point of all this, get the big sites using it so that the little ones might adopt it as well, the issue is that the cost of adding ssl does not add value to sites without logins. Perhaps letsencrypt.org will make it worthwhile to encrypt those static sites as well, it'd be nice to see hosting providers include this as a default.