http://gambaswiki.org/bugtracker/edit?object=BUG.952&from=L21haW4- Comment #4 by Mufeed ALI: Ok, i manually re-packaged the app with the desired icon following this tutorial: http://news.softpedia.com/news/How-to-Repack-Deb-Files-on-Debian-and-Ubuntu-404930.shtml Now, its ok. But it should have been easier.