When a running a Lab on students' PCs, VirtualBox reserves a set of surprises. These are mainly due to hardware compatibility or to OS versions. Here is a non-exhaustive list (hopefully not modified next year) of the problems.

VT-x/AMD-V hardware acceleration is not available on your system

• hardware acceleration

change network settings host only adapter remove wifi

If problem change ip address of virtual interface

File - preferences - hostonly adapter