issues:
Failed to open a session for the virtual machine ubuntu.
Raw-mode is unavailable courtesy of Hyper-V. (VERR_SUPDRV_NO_RAW_MODE_HYPER_V_ROOT).
Resul
You have to disable Memory Integrity.
Go to Device Security, then Core Isolation, disable Memory Integrity and reboot.
It seems that Memory Integrity virtualizes some processes (in this case, VMware) and we get that error.
You can also disable Memory Integrity from Registry Editor if your control panel was saying 'This is managed by your administrator'.
Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity
Double click on Enabled and change its value from 1 to 0 to disable it.
Helpful source: https://forums.virtualbox.org/viewtopic.php?t=86977#p420584