wait what?
You should have an option for "run Live DVD Mode" or ""test kubuntu" or something similar
(cannot remember what it's called atm)
that option will just run kubuntu without installing anything.
That's what you are looking for.
And no, you can of course install the reprap host to your current linux installation too.
Just follow the hints
[
www.reprap.org]
If it's a host test you're after;
you can run the reprap host from windows as well;
maybe even my standalone version (I'd love to know if it runs on vista)
[
forums.reprap.org]
'sid