This happens after updating into the MacOS Bug sur. And then trying to start the VirtualBox VMs, Tried so far and no luck with below options,
- Un-installed and re-installed the VirtualBox
- Created completely new VM and tried
- Re-installed
Oracle_VM_VirtualBox_Extension_Pack-6.1.16
Anyone else came a cross with the same issue? any clue to resolve this would really appreciated.
This the the complete Error message
Failed to open a session for the virtual machine New Ubuntu.
The virtual machine 'New Ubuntu' has terminated unexpectedly during startup with exit code 1 (0x1).
Result Code: NS_ERROR_FAILURE (0x80004005)
Component: MachineWrap

brew install virtualboxfrom the terminal did the job for me, and “allow oracle” in “Security & Privacy” – Sid Jonnala Jul 15 '21 at 20:30brew install virtualboxcorrected the issue for me as well. – StevieD Jan 21 '23 at 16:56