Today's Ubuntu 18.04 update disabled my video driver. I'm running Ubuntu 18.04 on a Dell box with NVIDIA GP104 video card. After I ran Ubuntu's update patch this morning, I lost the use of one of my two monitors and the device app does not identify the video driver so it's using a generic. I have since performed a couple of cold boots to no avail. Any suggestions on either updating the video driver or reversing today's update packages? Thanks.