Check wheather the kernel module (vboxvfs) is loaded on the memory.

# lsmod | grep vboxvfs

If it is not, load it

# modprobe vboxvfs

Then mount the shared folder you already configured,

# sudo mount –t vboxsf VBox /home/vbox

Here VBox is the shared folder in guest os (windows) and /home/vbox the directory that you want to mount in host os (linux).

Posted by yonggun