I confirm your findings. I also found this: https://xubuntu.org/news/xubuntu-is-now-on-github/ which does suggests it is the official site. The ones I found were from just searching via a search engine.
** Changed in: xubuntu-docs (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2059801 Title: No PDF downloads at the official website To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xubuntu-docs/+bug/2059801/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs