mate-user-guide-1.26.1-alt1.noarch	freedesktop-desktop	info	desktop-file-validate utility printed the following message(s): /usr/share/applications/mate-user-guide.desktop: hint: value "GTK;Core;Documentation;" for key "Categories" in group "Desktop Entry" does not contain a registered main category; application might only show up in a "catch-all" section of the application menu;