Thanks for your reply. I found how to debbug by downloading the dragonruby-gtk-lowrez jam game. I noticed that in the linux hidden .dragonruby folder, there is 2 folder i didn't have in mine : "stubs" and "tmptree". So i just copied them and it works.
Now i can execute the linux binary file of my game. I just have a bug with my sprites : they are not displayed, but i think it is not related to the dragon-publish bug.
Thanks