Attaching shared folders to Ubuntu in VirtualBox

To mount shared folders in Ubuntu in VirtualBox, you must first install the VirtualBox enhancement function. In the VirtualBox shared folder, set D disk to share and name to D_DRIVE. Select fixed allocation and automatic mounting. I do not know why I cannot automatically mount the file in Ubuntu. The command for manually mounting sudo mkdir/mnt/D sudo mount-t vboxsf D_DRIVE/mnt/D is as follows, you can see the content of disk D. (Note: Study the automatic mounting problem and try to solve it completely)