I have a couple of problems from a default debian mediawiki install. Debian packagers seem to think it is an upstream problem, so here I am relaying the message.
First problem was with the missing Help:Editing page.
http://lists.alioth.debian.org/pipermail/pkg-mediawiki-devel/2005-September/...
And crufty URLs with "index.php".
http://lists.alioth.debian.org/pipermail/pkg-mediawiki-devel/2005-September/...
Best wishes,