If you hit "ALT+F2" you should get a text console.
If you can't login from there the problem may not be the GUI, you may
have a runaway process, or processes, eating up memory or cpu.
Cheers,
Brad
Is it not clear in my previous emails that I am behind lock screen? You can't start
KRunner/Alt+F2 when your system is locked.
Both of the time my KDE box did it I directly went to tty and ran htop. There was no
process misbehaving.
Regards,
Sudhir Khanger,
sudhirkhanger.com.