I was in the Wayland session, and after seemingly successful update and reboot it was as if the password was not recognized at login; no such message, just the password field gets empty after "enter".
Trying to log in X session, the password seems accepted but the process freezes during the following splash ("welcome to Plasma").
How to troubleshoot this? Can it be repaired from a live USB session of October ISO? (I don't have a working KaOS now, but I have Kubuntu LTS and Windows 10 working.)