I am about to install Ubuntu 13.04 on my AMD x64 machine and the installation of the lib packages seems to take forever. Is that a known issue?

I know that it might take some time when checking to download packages from the Internet but this went through very fast.
In the terminal-like view I can see, the system is just unpacking, installing, configuring etc. in a quite slow way.

In the opening screen it reads: It just takes a few minutes (or something close to that).

Again: Is that a normal behavior or am I doing something wrong and what could I do to speed up the process in case I'm running an installation again on another system?