I had some issues with mounting shared folders with Virtual Box because they don’t appear anywhere. I finally figured out that the Shared drive is already there, it’s just not showing anywhere.
Before continuing, making sure you have installed the latest version of Guest Additions and your user is added to the vboxsf group.
First, add a shared folder under Devices -> Shared Folder Settings with the following properties (I am using windows in this example),
Folder Path: C:your-folder
Folder Name: shared-name-on-ubuntu
Go to a folder, e.g. ~/ and run
Finally mount it
sudo mount -t vboxsf shared-name-on-ubuntu ~/shared-name-on-ubuntu
And now you should be able to see everything shared within Ubuntu.