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).
Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}
UPDATES: Solution is given below.
You may need to disable the hypervisor.
So, follow the next steps:
1) Open command prompt as Administrator
2) Run bcdedit to check hypervisor status:
bcdedit
3) Check hypervisor launch type:
4) If is set to auto then disable it:
bcdedit /set hypervisorlaunchtype off
5) Reboot host machine and launch VirtualBox again