I have hit a blank wall I must have missed something, my machine is cpu ryzen 5 3600, 32 gb ram , and radeon rx570 with 8gb ram I am using a seperate hard drive for virtual box to run ubuntu and kali. I have tried all 64 bit versions of kali and ubuntu all end with a dark screen with dragon logo. Out of desperation I downloaded and tried the 32 bit versions which both loaded and started ok. In 64 bit mode it all install satisfactorily but when re boot there is no log in just the dark page with logo. why cant I use the 64 bit is there something I have missed. Runninfg windows 10 pro 64bit all upto date.