Installing VirtualBox extensions solve the problem but the program "Out of the box" doesn't work because these extensions are not in the repositories and must be downloaded from VirtualBox web.
http://download.virtualbox.org/virtualbox/4.3.18/Oracle_VM_VirtualBox_Extension_Pack-4.3.18-96516.vbox-extpack
Installing VirtualBox extensions solve the problem but the program "Out of the box" doesn't work because these extensions are not in the repositories and must be downloaded from VirtualBox web.
http:// download. virtualbox. org/virtualbox/ 4.3.18/ Oracle_ VM_VirtualBox_ Extension_ Pack-4. 3.18-96516. vbox-extpack