To get the key working, you must first download it from Oracle. Without this key, your Debian system will refuse to refresh the repo, going so far as to call it a security risk. The new VirtualBox software repository is set up on Debian Linux, but it’s not ready to use yet, as the repo doesn’t have the signed GPG key set up.We recommend the best way to install 32-bit apps on a Mac nowadays is by using Parallels. There are various virtual environments you can use for this but not all of them work on macOS Catalina or Big Sur because some of them, like Wine, are 32-bit applications themselves and don’t work on the latest versions of macOS.
I was thinking perhaps doing it to have the first Hackintosh Virtulization program, and the nice thing is that Virtualbox supports Linux/Windows/OS X.