Automount a shared folder in virtualbox for ubuntu

once fstab is open (sudo nano -w /etc/fstab), add this command to the bottom:

Share /Shared vboxsf defaults 0 0

Share=what you named the shared host folder in Virtualbox.
Shared=the location of the folder you want the shared files to appear in.

I named my shared host folder "Music", and the folder I wanted the files to appear in was "/home/eric/Musicshare", so my example would be:

Music /home/eric/Musicshare vboxsf defaults 0 0