I'm trying to install guest additions on BigSur on a virtual machine. I'm following this guideline: https://stackoverflow.com/questions/41691803/how-to-install-guest-addition-in-mac-os-as-guest-and-windows-machine-as-host but the command to access recovery mode gives me operation not permitted:
There is a way to access recovery mode from a virtual box machine maybe simulating
cmd+r inserting? Or there is another way to install guest additions?