Hi, Ken,
Sorry to hear you're experiencing this issue.
Usually, this problem is caused by a corruption of the Hyper-V. Uninstalling and reinstalling the Hyper-V would fix this problem.
Step 1: Uninstall
1-Click on Start, search for "Turn Windows features on or off" and click on that
2-Uncheck "Hyper-V" and "Virtual Machine Platform"
3-Then click on OK to uninstall and reboot your PC
Step 2:Re-install
1-Click on Start, search for "Turn Windows features on or off" and click on that
2-Check "Hyper-V" and "Virtual Machine Platform"
3-Then click on OK to install and reboot your PC
Step 3: Set Hyper-V to start automatically with Windows.
1-Click on Start, search for Command Prompt
2-Right-click on that and select "Run as Administrator"
3-Paste this command and press Enter:
bcdedit /set hypervisorlaunchtype Auto
4-Reboot your PC and try to install Ubuntu again
I hope this information helps. If you have any questions or the problem persists, please let me know and I'll be glad to assist you further.