dh_desktop was a debhelper program that registers .desktop files.
However, it no longer does anything, and is now deprecated.
If a package ships desktop files, they just need to be installed in the
correct location (/usr/share/applications) and they will be registered
by the appropriate tools for the corresponding desktop environments.
This program is a part of debhelper.
Ross Burton <firstname.lastname@example.org>
9.20160115ubuntu3 2016-03-31 DH_DESKTOP(1)
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