So I tried this in a Virtual Machine in Oracle VirtualBox 6.1.18 on a MacBook Air running the latest version of Big Sur, I encounter a fatal error when I try to log in to the desktop. This happens after I install the Virtualbox Guest Editions CD image.
The desktop remains black after I successfully input my password, and it stays black for hours. So I tried to reinstall the desktop environment from the root shell in GRUB, no errors. I tried to log in after that, then I encountered another error, but this time I think I have encountered my first kernel panic.