Klaus Hoeppner reported the same bug with his Debian 3.1 system,
Sounds like a bug in that Debian version of unzip ...
mount an iso-image or burn a dvd) maybe can also download "unzip"
binary from homepage
(http://www.info-zip.org/pub/infozip/UnZip.html), install it
I added this info to http://tug.org/texlive/bugs.html. Thanks.
Best,
Karl