I’m not sure what problem you are encountering exactly, but switching to another virtual terminal might still work.
By default, the virtual terminals are linked to the F1-F8 keys, and the combo to switch from a graphical session usually is CTRL+ALT+Fx.
On that other virtual terminal, you might be able to kill KWin.
I’m not sure what problem you are encountering exactly, but switching to another virtual terminal might still work. By default, the virtual terminals are linked to the F1-F8 keys, and the combo to switch from a graphical session usually is CTRL+ALT+Fx.
On that other virtual terminal, you might be able to kill KWin.