But what, if you don't have the permission to upload to main/universe/multiverse? So, inject your packages to your pbuilder enviroment via a local apt-get repository.
In this document I will describe how to setup a local apt-get repository, how to upload it to your root server via rsync and how to change your pbuilders sources.list.
You might wish to also check out LocalAptGetRepositoriesTrivial for a slightly easier way to make a local repository.