I've worked on gdebi hard but gdebi-gtk just doesn't work. I've tried 0.3.5 from unstable, 0.3.11 from Intrepid, and they don't work. It's hell buggy package, and its maintainer is MIA. So I think lenny is better without it.
That's enough. I'm giving up it. I want to work another RC instead of wasting my time and energy with this package. I'm givin' it up. Amaya; thank you very much for your interest. I'll ping you soon for another package ;) Rafael; if you want to try fixing gdebi, you can use my attached diff as a starting point. It contains some goodies, not just bugfixes ;) Regards
test_nmu.diff.gz
Description: GNU Zip compressed data