I found a workaround. I've installed a NVDIA card in the same PC and now everything works great.
I know it is not really helpfull but I am sure that the incompatibility is with my Intel video adaptor. Intel 82845/GL/GE/PE/GV -- [edgy][regression][ati] usplash freezes system when starting X https://launchpad.net/bugs/67487 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
