Ok, KDE, this is your last warning. Lock up again so that I have to reboot and you get kicked off my machine and I run something else. Be told. The whole point of moving to kubuntu is that people kept saying that KDE is good now. Either it’s unstable everywhere, or is unstable on Ubuntu, and either way it’s obviously not for me. Sigh. Why are computers rubbish?
@sil haven't had this happen ever. Generaly Intel gfx or low end separate card, on X not Wayland).
Try disableing the compositor (see system settings) to see if helps.
