upgrade or clean installation?

[Avraham Hanadari]

Dapper Drake will soon be making its appearance. I know there are ways 
to upgrade the OS, but I just installed the Kubuntu desk top on Ubuntu, 
and I think I prefer it. In addition to that, I've been doing a lot of 
learning and experimentation. I'm concerned about accumulated junk 
causing operational problems. In short, would it be better to make a 
clean installation when the time comes?

Thanks in advance,

Avraham