desktop-file-validate /usr/share/applications/hplip.desktop
/usr/share/applications/hplip.desktop: error: value "sh -c 'STARTED_FROM_MENU=yes /usr/bin/hp-toolbox'" for key "Exec" in group "Desktop Entry" contains a reserved character ''' outside of a quote
/usr/share/applications/hplip.desktop: error: value "sh -c 'STARTED_FROM_MENU=yes /usr/bin/hp-toolbox'" for key "Exec" in group "Desktop Entry" contains a reserved character ''' outside of a quote
/usr/share/applications/hplip.desktop: warning: value "Application;Settings;" for key "Categories" in group "Desktop Entry" contains a deprecated value "Application"
it should be
Exec=sh -c "STARTED_FROM_MENU=yes /usr/bin/hp-toolbox"