There a lot information which could help here ;-) What version of Kubuntu? What version of KDE? What version of the xserver-xorg package? What graphics driver/chip? Do you use any kind of 3D effects on your desktop?
There a lot information which could help here ;-)
What version of Kubuntu?
What version of KDE?
What version of the xserver-xorg package?
What graphics driver/chip?
Do you use any kind of 3D effects on your desktop?