For me a temporary workaround is to switch to tty1 and log in. When I then switch back to tty7 (lightdm) I can successfully log in. I have done this several times so it seems to be consistent.
For me a temporary workaround is to switch to tty1 and log in. When I then switch back to tty7 (lightdm) I can successfully log in. I have done this several times so it seems to be consistent.