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I have seen this on a few different computers, and the problem for me has always been graphics drivers. I'm not sure about your setup, but I was able to fix one (18.04, NVIDIA GTX 980) by switching to NVIDIA drivers, instead of using the default Ubuntu driver (Nouveau). I don't remember the specific steps (e.g., sudo apt-get install nvidia-driver-450, restart, etc.), but there are plenty of tutorials, like this one (not an endorsement). Here's my driver selection in Software & Updates for reference:

image description

Obviously, this will depend on your graphics card and VM configuration. Some VMs require extra effort to use the native hardware.

I have seen this on a few different computers, and the problem for me has always been graphics drivers. I'm not sure about your setup, but I was able to fix one (18.04, NVIDIA GTX 980) by switching to NVIDIA drivers, instead of using the default Ubuntu driver (Nouveau). I don't remember the specific steps (e.g., sudo apt-get install nvidia-driver-450, restart, etc.), but there are plenty of tutorials, like this one (not an endorsement). Here's my driver selection in Software & Updates for reference:

image description

Obviously, this will depend on your graphics card and VM configuration. Some VMs require extra effort to use the native hardware.

P.S. Solving the issue may only be a side effect of changing the drivers as I never came across a more specific solution, but it worked for me.