Install the Virtualbox Addons

To use the file transfer function, you need to first install the "Guest Additions". This is the driver that allows the guest OS "XUbuntu" to be aware of the host environment.

Select "Device" > "Insert Guest Additions CD image ...".

Double Click the CD-ROM icon on the desktop to open the file explorer.Then right click at the blank region and select "Open Terminal Here".Then type

sudo ./VBoxLinuxAdditions.run

Enter thecsci3150password and follow the instruction.