[Koha] I've hit a wall during install on Debian

Hi all, I am trying to get Koha 3.2.2 installed in Debian 507 and when I run the script apt-get-debian-lenny.sh I am unable to complete the script successfully because it seems as though some of the packages do not exist anymore. For example, the message I get when I try to run the script is: "Package libcgi-session-perl is not available, but is referred to by another package." Has anyone else seen this and what have they done to rectify the problem? Thanks, Sean