Problem Symptom: Windows users are reported that Oracle VM VirtualBox failed to open a session when try to start on Windows 10 after Windows Updates installed.
The detailed error message as below:
Failed to open a sessionn for the virtual machine
This article will cover the troubleshooting steps to fix Virtual Box VM failed to open or start in Windows 10.
Content Summary
Potential Causes
Solution 1: Update Oracle VM VirtualBox and Windows
Solution 2: Enable Hyper-V Windows feature
Solution 3: Disable Driver Integrity Checks
Solution 4: Set Paravirtualization Interface to KVM
Reference
Potential Causes
- Outdated Oracle VM VirtualBox software
- Missing Hyper-V
- Driver conflict
Solution 1: Update Oracle VM VirtualBox and Windows
Make sure to update Oracle VM VirtualBox from virtualbox.org and install the latest update for Windows 10.
Solution 2: Enable Hyper-V Windows feature
Step 1: Open the Start Menu.
Step 2: Search for the Control Panel and open it.
Step 3: Click on the Programs.
Step 4: Click on the link for Turn Windows features on or off.
Step 5: Check the Hyper-V.
Step 6: Click on the OK button.
Solution 3: Disable Driver Integrity Checks
Step 1: Click on the Search icon in the Taskbar to open Search box.
Step 2: Type cmd in the Search box.
Step 3: Click the Run as administrator to open elevated Command Prompt.
Step 4: The User Account Control (UAC) window will prompt. Click Yes to run the Windows Command Prompt as Administrator.
Step 5: Type or copy-paste the following command into the elevated command prompt and press Enter:
bcdedit.exe /set nointegritychecks on
Solution 4: Set Paravirtualization Interface to KVM
Step 1: Open the Oracle VM VirtualBox from the Start menu.
Step 2: Click the Settings > System > Acceleration.
Step 3: Set the Paravirtualization Interface to KVM.
Step 4: Click on the OK button.
