Ask Ubuntu -- about how to detach a file volume from a hard disk

For more information about how to detach a file volume from a hard disk on Ubuntu, general Linux technology, and Linux technology and applications, see the following. I cannot detach the file volume on the hard disk. The following prompt is displayed: "umount only allows root to detach/dev/sda5 from/media/sda5." How can this problem be solved? Currently, hard disks cannot be detached on the desktop, including "File System" on the desktop. hope everyone can answer this question. Thank you. Hope you can teach me more about cainiao.