I'm sorry that the repository does not work as advertised at the moment.
Part of the problem is that most of those packages are now in Debian
upstream.
The larger problem is that I have a new version of the Sage package
itself, but it's unusable at the moment because of a couple of serious
bugs involving polybori and linbox. Once those are settled, I think
things will be in good shape (of course, I've been having some difficulty
debugging them).
-Tim Abbott