We have observed that when attempting to run a VirtualBox image in Oracle VirtualBox, an error appears stating that VirtualBox is not signed with a build certificate ...

If you cannot open the guest session and get a VERR_NOT_FOUND VirtualBox error, follow the tips, solutions, and workarounds mentioned below. Check if “VBoxGuestAdditions.iso”n exists Insert Guest ...

The process for verifying disk images changed under Mac OS X 10.4.9 and later, becoming more stringent. As as result, many users are receiving the message "The disk image you are opening may be ...