Comment 1 for bug 769765

I just took a quick look at this, and replicated it. However, libapache-dbi-perl _is_ in the dependencies of rt3.8-apache2, but because of the way the dependencies have been phrased, apt decides to install speedy-cgi-perl is a fine stand-in for libapache-dbi-perl, and installs that instead. I don't know enough about phrasing .dep dependencies to know how fixable this is, though.