SymptomsWhile booting a 64-bit Linux kernel inside a virtual machine, there are no disk drives detected, neither CD-ROM nor HDDs:
Unable to find any devices of the type needed for this installation type. Would you like to manually select your driver or use a driver disk?
However, it is still possible to boot the system in 32-bit mode; everything works as expected. So, it is only impossible to install a 64-bit guest Operating System inside the virtual machine.