Windows 10: hyper v black screen problem

Hello,I added a checkpoint to an Ubuntu 20.04 virtual machine that I was using on Hyper V, and when my virtual machine had a problem, I deleted the checkpoint and now it does not open at all.When I want to install a new virtual machine, after the language selection screen, the disk check screen appears and after this check is completed, I am greeted with a white cursor on a black screen. I have been struggling for 2 days, can you please help?I tried the following methodsI tried the iso file in different virtualization applications, there is no problem.I grabbed and opened hyperv services.I res

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Hyper V deativication

Hi Geoffrey,

Hyper-V lets you run an operating system or computer system as a virtual machine on Windows. Before proceeding in disabling
Hyper-V, please create a backup of your files for security purposes.

To disable Hyper-V, please follow the steps below:

• On the Cortana search box, type Turn Windows Features on or off and press
  Enter.
• Look for the Hyper-V folder.
• Uncheck the tick-box next to the main Hyper-V folder and click
  OK.
• Restart your PC.

Should you have further questions, please let us know.

 

Black screen and realignment when switching to hyper-v window

When in situation

• currently on a host machine
  
• running and connected to a local hyper-v machine
  
• window with Hyper-V VM is minimalized
  
• Hyper-V session is set to fullscreen
  
• host and the VM are both Windows 10 with latest updates
  

then whenever the Hyper-v Virtual Machine Connection window is restored to full screen, the screen goes black for a second, then sometimes the windows within the VM are misaligned (e.g. not accounting for a vertical start bar), they stay that way for a moment and then start realigning themselves until the VM is finally usable.

There is some flicker even if the session is set to be windowed, though significantly less.

I am used to switching from host to VM often and also prefer full screen when in VM and this is very annoying.

Switching host Windows to Performance mode, disabling animations etc. didn't help.

On Windows 8.1 switching was very smooth, this has started after upgrade to 10 (currently on 1803 but the issue was before as well).
Is this something known? Any suggestions what to try to fix this?
Thank you

 

Hyper-V

That's the problem that I cannot find Hyper-V in Windows Features list, hence I am not able to turn it on or off.