It am able to precise the problem. In fact, I was using a feisty which was just a dist-upgrade from Edgy. Now I installed Feisty from Herd4. No more problems. So the problem is not a true Feisty Vs Edgy problem, but rather a problem in the way to upgrade from Edgy to Feisty.
-- wlassistant does not find my Wireless adaptater https://launchpad.net/bugs/80842 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs