[Koha] Deb package causes conflicts

Hello, I`m trying to set up Koha 3.2.9 from .deb package, but there`s a version conflict in one of required packages: Koha requires apache-mpm-itk 2.2.16-6, I have installed apache2-mpm-prefork 2.2.16-6+squeeze1. Debian version 6.0.1. Trying to resolve this resulted in more conflicts. Is there a way to install Koha from deb package without having to downgrade a bunch of other packages? Regards, Mordazy.