The symptoms are a bit different on AMD64 than i386 so I've made a
separate bug report:
There it does not even get as far as producing a graphical interface.
I only experimented with AMD64 (iso from Jan. 21.) and only had the issues
previously described, i.e. the window always appeared. Well, that was
Ubuntu, not Lubuntu. Could this eventually be blamed to LXDE?
And before all that, 894302 needs to be fixed. That bug is like removing all
function exports from a C-Library.