Installing this virtualization is very easy..

Installing process:

to install, just type this commands:

This is a simple/short how to for installing VirtualBox 7 in OpenSUSE 15

Here we are handling two problems:

1. There is no repo for OpenSUSE 15.4 (we need to do a trick)
2. There is no documentation on how to create proper UEFI secure boot MOK’s (owner keys) for the newer OpenSUSE which demands that the key will have special attributes like “codeSigning“

so, here is the answer: