$ desktop-file-validate /usr/share/applications/mlterm-mlterm.desktop /usr/share/applications/mlterm-mlterm.desktop: error: (will be fatal in the future): value "TerminalEmulator" in key "Categories" in group "Desktop Entry" requires another category to be present among the following categories: System /usr/share/applications/mlterm-mlterm.desktop: error: (will be fatal in the future): value "TerminalEmulator;" for key "Categories" in group "Desktop Entry" does not contain a registered main category This is because urxvt-rxvt-unicode.desktop contains this line: Categories=TerminalEmulator; That line has two problems: 1. it does not contain any main category. So it would be shown in the "Lost & Found" menu under KDE 2. FDO suggests[1] adding the "System" category when the "TerminalEmulator" additional category is used. To fix it, just change that line to : Categories=System;TerminalEmulator; [1] http://standards.freedesktop.org/menu-spec/latest/apa.html
Also see bug 421515, a similar request for rxvt-unicode .
Fixd in the tree. Thanks.