You can copy a file or folder from a Nautilus
window to the desktop. To copy a file or folder to
the desktop, perform the following steps:
Open a Nautilus
window.
In the view pane, display the file or folder that you want to move.
Press-and-hold Ctrl, then drag the file or folder to the desktop. An icon for the file or folder is added to the desktop. The file or folder is copied to your desktop directory.
Alternatively, select the file or folder, then choose Edit -> Copy Files. Right-click on any desktop object, then choose Paste Files.