Instantly replicated. Went to the site, clicked a random avatar to see their profile card. Image didn't load, server says no (403):
We don't use a CDN for Discourse, our uploads all stay together. They're using an S3 bucket on Amazon (which is a configuration choice). Possibly permissions over on AWS are not set up right. Or maybe they migrated at some point, so it could be that they need to update old objects permissions so they are public.
But then, weirdly, URLs are mostly this:
https://discourse.ubuntu.com/user_avatar/discourse.ubuntu.com/xxxxx/288/8750_2.png
A user has an avatar, but when you click on it to expand their card, the server takes forever to give a response, then comes back with a generic avatar.
Something's not right with Ubuntu Discourse on the CDN side. If someone knows the infrastructure person, please give them a prod. I don't know if there's a 'global' set up and it's simply one bad egg behind the load balancer that sometimes serves missing data.