Redmine ended up being a bust due to Debian shipping a version of ruby (1.8.7) that is incompatible with Ruby on Rails. Apparently it doesn’t work above 1.8.6. I am impressed that a language’s flagship application gets broken by a point release and no one seems to have anything to say about it other than “don’t use 1.8.7”.
I switched back to Trac despite its limitations because it actually works. Of course, then I had to set up its user authentication, which was a headache of its own. Sometimes I cannot win.
Now, to put things on wikis!