The correct link, that *should* be used, is:

- http://www.ubuntu.com/about/about-ubuntu/derivatives

That working link is given [in the help center][1], but this broken link is given in the about page / tour:

- http://www.ubuntu.com/project/derivatives

So to fix this, someone with the ability to edit the about page (moderators?) should change the link there [to this][2].


  [1]: https://askubuntu.com/help/on-topic
  [2]: http://www.ubuntu.com/about/about-ubuntu/derivatives