Make sure Exec points to the correct place.
Index: Distributions/dooble.desktop
--- Distributions/dooble.desktop.orig
+++ Distributions/dooble.desktop
@@ -3,7 +3,7 @@
 [Desktop Entry]
 Categories=Network;WebBrowser;
 Comment=Dooble Web Browser
-Exec=/usr/bin/dooble
+Exec=${TRUEPREFIX}/bin/dooble
 GenericName=Dooble Web Browser
 Icon=dooble
 Name=Dooble Web Browser
