I've heard a lot on problems of Knoppix upgrade after HD installation.

Now I've created localized version of Knoppix - Kazit.

It has great feature "knoppix-installer" but also it is known that it will have lots of upgrade problems.
For example when I tryed to install official Debian OpenOffice (because I need localization files) I had problems with packages bsh that conflicted with ash-knoppix. And so on.

What is the real risk of installation of Knoppix on HD? Is it possible to upgrade it?
What are problematic packages that proably can be removed in order to get cleaner Debian system?

It is quite important for me becasue if it is impossible to upgrade the system I'd prefare to remove knoppis-installer at all to prevent these kind of problems.

Thanks