Comment 3 for bug 1352653

I see, thanks. I think the package you describe is xfdesktop4 whose name in the .desktop file is "Desktop" only. So if you search for desktop in Software Center, you'll find it in the presented list.

You found the pcmanfm package, which provides Lubuntu's file manager and desktop preferences tool. The latter has a .desktop file with the name "Desktop Preferences". ;)

I can't tell if one or both should modify their .desktop files to prevent this confusion. Forwarding this bug report to the maintainers of respective package by changing the affected package.