The first thing which put me off after logging in to the kubuntu (9.10) desktop for the first time was the fonts. They are two problems I have with the default Kubuntu fonts (Well the first one is not much of a problem but personal taste.)
1: The default fonts The default font setup on Kubuntu Karmic is ok. But I wanted some better than ok, so I install the liberation fonts which has always served me well in the past (especially when I was a gnomie
) It comes as part of the Kubuntu-restricted-extra package.
You can install as a standalone package by clicking 
It can always install the package from terminal
sudo apt-get install ttf-liberation
