After some researchs, I have tested Umbrello which is directly installable from Synaptic and Bouml that you can find here in deb format package.

I found that Umbrello is very intuitive, you can import Java classes, make some code reverse engineering and of course generate code. But you don’t have all UML schemas (for example, I didn’t find sequence diagram).

Bouml includes every UML diagrams that I known and is a good alternative.