What is wrong with the CI forum

I confirm this problem.  No links from the main forum index page (http://forum.codeigniter.com/index.php) will work (all give 404 errors).

I am able to view posts from the "view new posts" link under my user name.

CI 3.1 Kubuntu 19.04 Apache 5.x  Mysql 5.x PHP 5.x PHP 7.x
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