I upgraded my Ubuntu from 16.04 to 18.04. Everything went fine and the upgrade was successful. But, after a few days, I played a .mp4 video with VLC player. The video played in full screen mode for 3 to 4 seconds and then the screen froze. The audio kept playing, but the video stopped, and both the keyboard and mouse stopped responding. The only way to get out of this was to force the computer to shutdown and restart it.
This happens every time with Ubuntu 18.04, but I never experienced this problem with 16.04.
I am a huge VLC fan. How can I fix this?