I just installed Kubuntu 18.04 lts and my keyboard and mouse pointer did not work properly during installation. After installation, it stops responding. But somehow Libre Office opened and the entire keyboard worked there. Nothing seems to work after the office closes. Had to shut down the system by force.
You need a solution for that. Could this be because I didn't check the ISO file before mounting it in USB (I didn't know how to check it either)?