I assume you were able to create an Ubuntu virtual machine with VirtualBox.
Set up VirtualBox shared folders
Let’s try now to share a folder between the host machine and the VirtualBox virtual machine.
First we need to create a folder on the host machine and set that folder as a shared folder in
Settings -> Shared Folder of VirtualBox Manager
Create a folder in the home directory of the VirtualBox virtual machine with that name.
In the virtual machine go to the top menu:
Devices -> Insert Guest Additions CD image...
Click “Run” on the popup and confirm with the root password
Mount Ubuntu VirtualBox shared folder
Once the installation finished run the command in the terminal to mount the shared folder in the VirtualBox Ubuntu virtual machine
Now if you go to the folder you’ll see that folders
blog on the host and the virtual machine have same content.
That means you successfully setup the VirtualBox shared folder for a Ubuntu virtual machine and you can access that shared folder from a Virtual Ubuntu virtual machine