I've encountered this bug on the past TWO kernel updates of my Xubuntu 16.04.4 (now .5) system that uses an Nvidia card. Initially I found that falling back to the previous kernel was a satisfactory workaround. This morning, I tried using the "Additional drivers" system setting to change from the Nvidia driver to the noveau driver -- and that has worked perfectly so far. This might be a possible recommended solution. I had originally switched from noveau to the proprietary driver because noveau didn't work properly, but that was several years ago and it has obviously gotten much metter!
I've encountered this bug on the past TWO kernel updates of my Xubuntu 16.04.4 (now .5) system that uses an Nvidia card. Initially I found that falling back to the previous kernel was a satisfactory workaround. This morning, I tried using the "Additional drivers" system setting to change from the Nvidia driver to the noveau driver -- and that has worked perfectly so far. This might be a possible recommended solution. I had originally switched from noveau to the proprietary driver because noveau didn't work properly, but that was several years ago and it has obviously gotten much metter!