If VirtualBox is not booting from ISO or if GParted ISO is not mounting, correct the Boot Order in System Settings and verify ...

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 ...

In order to rule out that it's not an issue with that physical computer and in order for the thing to be reproducable, i thought of trying it in a Virtual Machine 'cos if anybody here could get it ...