I have installed xfce around 4 days ago on my Ubuntu 18.04 system as a more light-weight alternative to GNOME. Today, my computer asked for the password but I was unable to enter text in the password text field. My virtual terminal doesn't work as it asks for a login and the password is always incorrect. My power button is broken and xfce4 has no interface for turning off the computer during the login screen. The keyboard works, seen by the fact that the password prompt detects caps lock and the keyboard could type the login in the virtual terminal.