VirtualBox setting up a shared folder in Linux Ubuntu 16

1. From VirtualBox enter your VM settings > shared folders and add a new one; choose the path in your host machine name it FOLDER_NAME and check Auto mount and make permanent.
2. Install Guest additions; look at this to see how. In summary:

   sudo apt-get update
   sudo apt-get install build-essential linux-headers-$(uname -r)
   sudo apt-get install virtualbox-ose-guest-x11
   sudo apt-get install virtualbox-guest-dkms
   reboot
   

3. Make a folder on your guest VM to point to the folder created on the host, just create a new folder, for example /home/"your_user_name"/shared
4. Mmount the shared folder: sudo mount -t vboxsf "FOLDER_NAME" /home/"your_user_name"/shared
5. To make the mount automatic, add mount -t vboxsf "FOLDER_NAME" /home/"your_user_name"/shared" to the end of "/etc/rc.local" before "exit 0"